Chinesium 17t logs

[Threetirtyfive]

Hi guys, 20k miles into owning my China 17t turbos thought you may want to see some logs pushing them close to 30psi

datazap.me | Threetirtyfive | 25 may

datazap.me

Hoping to get above 30 very soon on my low comp forge build.

With the talk of not being able to push twins at high boost for long I wanted to show I've had no issues. They've been run 26psi early days 24 months ago to now targetting 30.
These were bought in the early days for 550quid.

 

[turbohugh]

wow looks fast. Some strange timing corrections. Any more details about the build. IAT's look great. Wonder what plugs / coils you're running.

 

[Threetirtyfive]

From googling, the cylinder 5 timing corrections are a 'feature' of this engine at high levels of tuning. I would expect I can fix it with more octane (more meth flow). I'm not overly bothered by the correction. I'm running 2800cc meth (80/20), a friend who ran almost identical setup (save for having proper branded turbos) but had a low comp build was at about 34-37psi boost and 4000cc meth. (his car got written off sadly). I've got the larger nozzles and a second pump on order so will go that route later if necessary.
I'm using Bosch s55 coils and 97506 plugs. No misfires at all.

I'm also using the stock charge pipe drilled for meth at nearly 30psi, so people saying they bang at stock boost, they really don't unless they've already got weaknesses in them. There are other pipes on the way from the turbos made of the same plastic people never complain about bursting (such as the J pipe).

(engine has FCP rods, JE 9.5:1 pistons, King SV main and big end bearings, Vargas Crank hub fix). (EDIT - mapping with Fabian at Pureboost.de )

 

[carabuser]

Logs look good, just need to work on the fuel scalar to get the trims flatter.

From googling, the cylinder 5 timing corrections are a 'feature' of this engine at high levels of tuning. I would expect I can fix it with more octane (more meth flow). I'm not overly bothered by the correction. I'm running 2800cc meth (80/20), a friend who ran almost identical setup (save for having proper branded turbos) but had a low comp build was at about 34-37psi boost and 4000cc meth. (his car got written off sadly). I've got the larger nozzles and a second pump on order so will go that route later if necessary.
I'm using Bosch s55 coils and 97506 plugs. No misfires at all.

I'm also using the stock charge pipe drilled for meth at nearly 30psi, so people saying they bang at stock boost, they really don't unless they've already got weaknesses in them. There are other pipes on the way from the turbos made of the same plastic people never complain about bursting (such as the J pipe).

(engine has FCP rods, JE 9.5:1 pistons, King SV main and big end bearings, Vargas Crank hub fix).

I agree about the charge pipe. It's one of those mods like DCI that people just buy because vendors tell them to.

 

[Threetirtyfive]

Regarding DCI, I was in agreement until recently but once you run 500+ the airbox with panel filter is a restriction. I did back to back dyno testing. It significantly chokes the engine above 5000RPM. Once running sufficient boost and meth the additional heat ingested doesn't noticeably affect engine performance at low RPM (where I noticed it prior to running meth).

 

[fmorelli]

Regarding DCI, I was in agreement until recently but once you run 500+ the airbox with panel filter is a restriction. I did back to back dyno testing. It significantly chokes the engine above 5000RPM. Once running sufficient boost and meth the additional heat ingested doesn't noticeably affect engine performance at low RPM (where I noticed it prior to running meth).

Note ... you assume it is the panel filter and airbox ... and you could be right. My observation is that the air inlet over the radiator is a significant issue, when you do the math.

Filippo

 

[RSL]

It would be great if he did the DCI/stock box (with scoops and inlets) back to back on the road instead and posted log csv's so I can overlay. As far as intakes go, I don't buy dyno tests at all. Car going 130mph while standing still is hardly comparable.

2-3 logs of each intake on the same tune/same spot/same direction/same day would be much more telling if the stock box is any restriction actually driving it.

 

[Threetirtyfive]

It would be great if he did the DCI/stock box (with scoops and inlets) back to back on the road instead and posted log csv's so I can overlay. As far as intakes go, I don't buy dyno tests at all. Car going 130mph while standing still is hardly comparable.

2-3 logs of each intake on the same tune/same spot/same direction/same day would be much more telling if the stock box is any restriction actually driving it.

Based on wgdc it does make a difference.
Also for CFM where psi becomes irrelevant.

 

[fmorelli]

It would be great if he did the DCI/stock box (with scoops and inlets) back to back on the road instead and posted log csv's so I can overlay. As far as intakes go, I don't buy dyno tests at all. Car going 130mph while standing still is hardly comparable.

2-3 logs of each intake on the same tune/same spot/same direction/same day would be much more telling if the stock box is any restriction actually driving it.

Agree. Let me just add ... for lots of us 2x power is zip code for builds. 2x power requires about 2x air. BMW designs are engineered for application. Back of the napkin I'd be surprised if the whole inlet assembly is not a bottleneck as the juice goes up. Again back of the napkin. But I agree with your comment, just adding on.

Filippo

 

[RSL]

Based on wgdc it does make a difference.
Also for CFM where psi becomes irrelevant.

On the dyno or on the road? I've had 0% diff WGDC or power on the road with scoops/inlets on 15Ts and low/mid 20s boost and have tested many intakes back to back multiple times, including DCI and stock box with a paper filter no less.

Every time I think the intake has got to be restriction by now, it proves me wrong. This is more about trying see where stock box might actually be restriction on the pavement, maybe that is between 25psi on 15Ts and 30psi on 17Ts. Been waiting 4.5 years for my Hexons to fail so I can buy HP's and test intakes with more lol

 

[Threetirtyfive]

I've got the corresponding logs for this.
For reference this is a really unforgiving dyno, equivalent to a conservative Mustang dyno.

 

[RSL]

DD can be rough on output. More interested in logs for DCI and stock box+scoops on the road with your dyno tune/boost level if you're able. Don't really care what the output numbers are, so long as they are comparable as far as tune, slope, gear, ambient, etc. We just need relative difference between them.

On a dyno, shorter/less restrictive intake tract always wins because inducer must pull the air through the entire tract with little or no help. Closed intake with scoops on the road reduces pressure loss because air is being forced into the intake as well. I expect there would be much less/no difference on the street as opposed to dyno, but don't know of anyone bothering to log different intakes at levels that high yet. I can't or would have long ago.

As for CFM, not entirely sure where that will cap at, but I definitely haven't found it.