turbo with no intercooler?

squeedle

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May 29, 2017
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Disclaimer: No, I'm not considering doing this. I'm just curious if anyone has, or if it's even possible. But could you run a turbo(s) with no intercooler if you used water/meth injection? Would IATs still be too high to be useful? Or would it be feasible as long as boost was low enough? Seems like theoretically it could reduce lag significantly.
 

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Nov 14, 2016
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Unless, you don't care about possibly knocking the engine into it's grave... I'd run an intercooler.

Imagine this, Stock turbos and intercooler at WOT will easily reach 140+ IATs on a 80 degree day. Meth/Water/Ethanol will only help so much. Intercoolers are NEEDED 100% for this platform IMO
 
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Bmwfixerguy1

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Jun 5, 2017
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With stock turbos absolutely not.. They are just to inefficient at higher boost and super heaters of air.
Now if I was in a big single and it was a dedicated drag car or something yes I'd absolutely consider it or at least give it a trial.
This is actually very common practice in the v8 turbo world.
My buddy runs his SBF on a bigggg turbo and meth, turbo outlet to throttle body piping is like an arms length!
 

V8bait

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Nov 2, 2016
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You need E85 or meth as you primary fuel, or e85 and water/meth. You need to run it rich, not lean, with an efficient turbo, generally at mid level boost (higher boost raises temps a lot) and it's best for short races (1/4 mile) not long races. But yes it's possible, yes it's done often, and yes there are advantages. But there are also disadvantages.

SBC's do it a lot with built motors, where you can run like 20psi and make 1500+hp. It's not really ideal for a daily with high specific output like our cars, an A2W would be a better way to lower pressure drop and shorten chargepipe IMO, similar to the new M.
 
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Bmwfixerguy1

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Jun 5, 2017
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You need E85 or meth as you primary fuel, or e85 and water/meth. You need to run it rich, not lean, with an efficient turbo, generally at mid level boost (higher boost raises temps a lot) and it's best for short races (1/4 mile) not long races. But yes it's possible, yes it's done often, and yes there are advantages. But there are also disadvantages.

SBC's do it a lot with built motors, where you can run like 20psi and make 1500+hp. It's not really ideal for a daily with high specific output like our cars, an A2W would be a better way to lower pressure drop and shorten chargepipe IMO, similar to the new M.

True that.. On a budget built small block turbo with meth its very common.. On a daily driving car outside of Antarctica its not a good idea..
To give you an idea of how effective meth can be over an Intercooler..
Toying around one night logging I decided to put some meth in the freezer (about 4hrs) well it worked too good and it 90 Deg F that night I iced my throttle and set all kids of throttle jammed and plausibility faults.. Its was painfully cold to touch lol
 
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Notmpwr

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Jul 5, 2017
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I've done none intercooled up to 1200hp with e85 and e98. The tubing window is very small, pre turbo or volute meth injection helps. I've maxed gm iats out in a 1/8 mile pull and not had issues. Is it ideal, no. Can it be done, yes. Now I would not attempt it with a di engine because you don't get the latent heat reduction from the ethanol evapoting like you do with a port injection engine. The distance from the runner to the intake is short but it does make a difference. I have played with running two id1000's in the charge pipe pre tb spraying e98 and it worked damn good but it's dangerous. Kevin jewer with the blue rwd dsm spays a ungodly amount of e85 on his compound setup but it has had a fire or two.
 
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Dlarrym1

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Apr 24, 2020
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Disclaimer: No, I'm not considering doing this. I'm just curious if anyone has, or if it's even possible. But could you run a turbo(s) with no intercooler if you used water/meth injection? Would IATs still be too high to be useful? Or would it be feasible as long as boost was low enough? Seems like theoretically it could reduce lag significantly.

Disclaimer: No, I'm not considering doing this. I'm just curious if anyone has, or if it's even possible. But could you run a turbo(s) with no intercooler if you used water/meth injection? Would IATs still be too high to be useful? Or would it be feasible as long as boost was low enough? Seems like theoretically it could reduce lag significantly.

Ive wondered the same thing. If you have a big enough turbo and used the shortest possable charge pipe from the turbo to the throttle body. Notmal system w/a turbo puts an intercooler in between thoe turbo and throttle body because when the charge of air goes up from outside air into the turbo it gets heated above ambiant temp. So, it, (intercooler) brings the temp at the point it enters the engine back to a temp as cool as possable because cool air is dense airđź‘Ť.
But I've thought about the fact that 1) when the "packet(s)" of air go through the bends of a charge pipe and the passages inside the intercooler, it gets slowed down and thus the pressure at point of entering the engine is slightly redused. 2) the charge pipes get hot too, equal too the ambient temp of the engine compartment. That adds more temp to the air going to the intercooler so it has to start with air heated by said pipes and tubo. The air spends way less time in the turbo so the heat increase if you do the math, a lot of the added heat comes from the charge pipes themselves to the intercooler & from intercooler to throttle body. The piping can get sort of heat soaked.
3) The bends and shape of piping changes to meet engine compartment size slows the air and puts piping close to hot parts. The channeling inside most intercoolers slows the air charge some.
SOOO... Why not use a super short charge pipe straight from turbo to throttle body...no intercooler at all. You do away with all that piping, do away with all the air resistance... Would the little heat loss you get from an intercooler and the power you get from that...Has it been tested against the same engine but the 2nd one would have as a direct a path to the throttle body as possible... The pressure would be better. Much less lag. The air, even when traveling via a square or round tube,nit will stay as tight to the center and away from the walls as it can. Its taking the path of least resistance. They measure the intake temp from the cylinder head, rt where the air goes in the engine at the intake manifold. Its so close to the cylinder head that its gonna show a much higher temp then the air actually is at its center in the columns of air going down each runner. If you give the air charge as a direct enough path, I theorize, that in the right set up, you would come out ahead. Especially if you used h20-meth injection in your system... multiport h20/meth with a new intake manifold and its already set to use inhectors and has its own fuel rail and is water cooled as well. A piggy back runs the system. This is on a direct injection engine Iike found in an Audi or VW. It helps carbon build up a whole lot too. I generally really like the idea of h20-meth w/multiport injection at the cylinder head and intake manifold just like a regular multiport on Direct injection engines so they sort of have both.. very cool. In europe a few vw's and Audi used engines like that but it wasnt h20/meth. They had both direct injection and multiport but just gas on all. The cars computer would switch depending on hwy driving or city or performance driving. But, aside of this intercooler or no intercooler topic. I hope my idea has merit. I haven't run the numbers to really know and def haven't had 2 identical cars and the $ to go play with the idea soooo, who knows..someone does? I dont know which is better. Now in F1 cars, they have aero space designed, polished carbon fiber intercoolers & short charge pipes so they will always have a gain with an intercooler but that is Apples and Oranges. In a sedans engine bay, (like any BMW as we know as an example), you have a whole other set of issues. I dont think some really get into the fine details. A lot of things beside heat can rob power from your car. Im not doing this either except to try to get creative with some high temp VITON™️, high temp rated tubing. Its flexable with a very special "coil" to keep it from collapsing. Its not available pre-bent into certain shapes to my knowledge, but its surprisingly flexible but its I.D. doesn't change. It also has a sort of "liner", inside its entirety and it gives it very good air flow through. It's very pricy but what doesn't on a build. Ive considered using it for a while. I worked ffor a company that made plasma torches for all manor of industries.. these were huge ones..likex14 inch ooenings on the front electrodes. They used thid Vinton tubing allnover the place and these torches got over 12,000 degrees f. Yes 5 digits...no mistake. They cut up US M1 Abrams tanks like butter. They were used in sooo many technologies. We made small ones that were 6 inch around for universities to use.. 100kilowatt torches but some had to have thier own sub stations and used 12 phase power to emulate DC power. These used 10-14 megawatt torches!!! and even bigger ones used in countries like Korea for municipal waste removal I could get way technical...lol
This is rambling on so im gonna go. Im new and found this forum looking for intercooler knowledge. Sorry if my 1st post is too over the top.
Thanks
 

The Convert

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Jun 4, 2017
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Ive wondered the same thing. If you have a big enough turbo and used the shortest possable charge pipe from the turbo to the throttle body. Notmal system w/a turbo puts an intercooler in between thoe turbo and throttle body because when the charge of air goes up from outside air into the turbo it gets heated above ambiant temp. So, it, (intercooler) brings the temp at the point it enters the engine back to a temp as cool as possable because cool air is dense airđź‘Ť.
But I've thought about the fact that 1) when the "packet(s)" of air go through the bends of a charge pipe and the passages inside the intercooler, it gets slowed down and thus the pressure at point of entering the engine is slightly redused. 2) the charge pipes get hot too, equal too the ambient temp of the engine compartment. That adds more temp to the air going to the intercooler so it has to start with air heated by said pipes and tubo. The air spends way less time in the turbo so the heat increase if you do the math, a lot of the added heat comes from the charge pipes themselves to the intercooler & from intercooler to throttle body. The piping can get sort of heat soaked.
3) The bends and shape of piping changes to meet engine compartment size slows the air and puts piping close to hot parts. The channeling inside most intercoolers slows the air charge some.
SOOO... Why not use a super short charge pipe straight from turbo to throttle body...no intercooler at all. You do away with all that piping, do away with all the air resistance... Would the little heat loss you get from an intercooler and the power you get from that...Has it been tested against the same engine but the 2nd one would have as a direct a path to the throttle body as possible... The pressure would be better. Much less lag. The air, even when traveling via a square or round tube,nit will stay as tight to the center and away from the walls as it can. Its taking the path of least resistance. They measure the intake temp from the cylinder head, rt where the air goes in the engine at the intake manifold. Its so close to the cylinder head that its gonna show a much higher temp then the air actually is at its center in the columns of air going down each runner. If you give the air charge as a direct enough path, I theorize, that in the right set up, you would come out ahead. Especially if you used h20-meth injection in your system... multiport h20/meth with a new intake manifold and its already set to use inhectors and has its own fuel rail and is water cooled as well. A piggy back runs the system. This is on a direct injection engine Iike found in an Audi or VW. It helps carbon build up a whole lot too. I generally really like the idea of h20-meth w/multiport injection at the cylinder head and intake manifold just like a regular multiport on Direct injection engines so they sort of have both.. very cool. In europe a few vw's and Audi used engines like that but it wasnt h20/meth. They had both direct injection and multiport but just gas on all. The cars computer would switch depending on hwy driving or city or performance driving. But, aside of this intercooler or no intercooler topic. I hope my idea has merit. I haven't run the numbers to really know and def haven't had 2 identical cars and the $ to go play with the idea soooo, who knows..someone does? I dont know which is better. Now in F1 cars, they have aero space designed, polished carbon fiber intercoolers & short charge pipes so they will always have a gain with an intercooler but that is Apples and Oranges. In a sedans engine bay, (like any BMW as we know as an example), you have a whole other set of issues. I dont think some really get into the fine details. A lot of things beside heat can rob power from your car. Im not doing this either except to try to get creative with some high temp VITON™️, high temp rated tubing. Its flexable with a very special "coil" to keep it from collapsing. Its not available pre-bent into certain shapes to my knowledge, but its surprisingly flexible but its I.D. doesn't change. It also has a sort of "liner", inside its entirety and it gives it very good air flow through. It's very pricy but what doesn't on a build. Ive considered using it for a while. I worked ffor a company that made plasma torches for all manor of industries.. these were huge ones..likex14 inch ooenings on the front electrodes. They used thid Vinton tubing allnover the place and these torches got over 12,000 degrees f. Yes 5 digits...no mistake. They cut up US M1 Abrams tanks like butter. They were used in sooo many technologies. We made small ones that were 6 inch around for universities to use.. 100kilowatt torches but some had to have thier own sub stations and used 12 phase power to emulate DC power. These used 10-14 megawatt torches!!! and even bigger ones used in countries like Korea for municipal waste removal I could get way technical...lol
This is rambling on so im gonna go. Im new and found this forum looking for intercooler knowledge. Sorry if my 1st post is too over the top.
Thanks
It just needs gone back through and cleaned up for readability.