GT28R, 7psi, stock internals, 230hp

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coldfire07
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GT28R, 7psi, stock internals, 230hp

Post by coldfire07 »

So, after two years of having a KA-T and not knowing power/AFR, I got my ass to the dyno today. Made 3 4th gear pulls. Here's the setup

GT28R (s15 turbo), boost controlled by internal gate at 7psi
SSAC bottom mount manifold
z32 MAF
550cc Injectors
Second hand Enthalpy ECU
Walbro fuel pump
ebay intercooler/piping
Megan racing turbo elbow
3" downpipe, cat, RS-R GT2 3" back
~190 compression on all cylinders last time I checked.. not sure why it's so high, but can't complain

Somebody had burned the wire that sends the wideband signal to the dyno, but it was still operational to look at. I was around 12.3 up until ~3.5k RPM and then it dropped off to 12.0 straight across.

I'm very happy with what it made, didn't think it was going to be this high or this smooth and consistent for what I'm running. With correction on, it was at 240whp.

Now it's time to install the manual boost controller I have lying around and raise it to 10-12psi. Turbo is good to 18psi, and the engine still has a lot of roomI'll post some pics of the car shortly.

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turbo240ka24det
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Post by turbo240ka24det »

Any chance you will be hitting a quarter mile track when they open up?
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coldfire07
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Post by coldfire07 »

turbo240ka24det wrote:Any chance you will be hitting a quarter mile track when they open up?
Probably not, I'm not too into drag racing. Random calculators on the internet say it should be a 13.4 or something, no idea how accurate they are.
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Post by jung918 »

How is the spool of the turbo and at what rpm does it start to kick in?
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coldfire07
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Post by coldfire07 »

jung918 wrote:How is the spool of the turbo and at what rpm does it start to kick in?
Umm... it spools pretty quick. Look at the torque curve, I have like 90% of peak torque at 3k RPM.
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Post by Turbo24sxt »

nice work ... ur pretty risky running those A/F on a stock motor .. id richen it up a little .. might lose a little power but will keep your motor longer ... non the less nice job ...
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Post by adamky »

Wow, nice torque curve. (even though there's not much of a "curve" to it!)

coldfire07 wrote:~190 compression on all cylinders last time I checked.. not sure why it's so high, but can't complain
I've heard various compression testers can have different results. I tested mine recently with a Harbor Freight compression tester, and it was 205-210 across all 4 cylinders. As long as they are the same across all 4 cylinders, I'm not worried about it.
Wiseco/Eagle, JWT S1 cams, BC valve springs, PT5857, ID1700 injectors, SR20DET ECU w/ Nismotronic, COP conversion with LS ignition coils, etc, etc...
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Post by p00t »

compression numbers are influenced a lot by how powerful ur battery is :/ The difference between an interstate batt and a small hawker was 15 psi.. 175 vs 190. On a stock DE of course (mine). plus a little carbon build up helps too :)

EDIT: why are you letting off the throttle so soon? ur HP is looking like it will peak around 6k... prolly should shift at or a little after 6500.
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Re: GT28R, 7psi, stock internals, 230hp

Post by adamky »

coldfire07 wrote:So, after two years of having a KA-T and not knowing power/AFR,
I just noticed this part. So, for two years you've been running without a wideband in the car?
Wiseco/Eagle, JWT S1 cams, BC valve springs, PT5857, ID1700 injectors, SR20DET ECU w/ Nismotronic, COP conversion with LS ignition coils, etc, etc...
--> YouTube channel --> my build thread
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Re: GT28R, 7psi, stock internals, 230hp

Post by slowKA »

adamky wrote:
coldfire07 wrote:So, after two years of having a KA-T and not knowing power/AFR,
I just noticed this part. So, for two years you've been running without a wideband in the car?
See, it can be done! :lol:
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Post by PandaPants »

turbo looks like it kicks in @ ~3k. nice a/f r. bet you love that enthalpy
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Post by turbonola »

i have a friend who made those numbers on a t25. i honestly thought they'd be a lil higher with a t28 maybe like a 5-10hp difference. oh well guess i'll just hafta go with a gt28rs to one up him.
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Post by adamky »

turbonola wrote:i have a friend who made those numbers on a t25. i honestly thought they'd be a lil higher with a t28 maybe like a 5-10hp difference. oh well guess i'll just hafta go with a gt28rs to one up him.
Different dynos can have different results. It's just a number, don't put too much stock in it. A T28 should easily pick up 10-20 hp over a T25.
Wiseco/Eagle, JWT S1 cams, BC valve springs, PT5857, ID1700 injectors, SR20DET ECU w/ Nismotronic, COP conversion with LS ignition coils, etc, etc...
--> YouTube channel --> my build thread
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Post by turbo240ka24det »

adamky wrote:
turbonola wrote:i have a friend who made those numbers on a t25. i honestly thought they'd be a lil higher with a t28 maybe like a 5-10hp difference. oh well guess i'll just hafta go with a gt28rs to one up him.
Different dynos can have different results. It's just a number, don't put too much stock in it. A T28 should easily pick up 10-20 hp over a T25.
Exactly! Put those two cars on the same dragstrip and compare trap speeds, we'll see the true weight-to-power ratio there.
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-16.2 @ 84mph baseline run before turbo
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coldfire07
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Re: GT28R, 7psi, stock internals, 230hp

Post by coldfire07 »

adamky wrote:
coldfire07 wrote:So, after two years of having a KA-T and not knowing power/AFR,
I just noticed this part. So, for two years you've been running without a wideband in the car?
Yeah, haha. Always ran pig rich when the car got the slightest bit warm. ***** blew.

This last weekend, I sprayed some MAF cleaner... and now the car runs great. ***** so stupid that it took me that long to think to clean the MAF. My battery is nothing special, and it's mounted in the trunk. Some random battery that came with the car four years ago. Did another compression test this week, still 180-190 straight across somehow (new compression tester too).

I have a manual boost controller sitting around... now that I've fixed the problem I've always had with the car running rich, I'm going to install it and go from ~6psi to around 10 or so. Should be 260whp hopefully.
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Post by turbo240ka24det »

Do you have any high quality videos of the 240 w/ the RSR exhaust? Curious to know what it sounds like.
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Post by ka-torqy »

get some cams, and turn the boost to 18.
very nice powerband and how qucik do you reach fool spool (rpm) definitly wanna see what these turbo can hit with 18psi and maybe some cams with a good tune. ill beat itll be pretty fun to have a really quick spoolin turbo hittin aroun 320 or so
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Post by s13intheworks »

i have the same setup

but at 9psi its lots of fun man

but i got greedy and went to 15psi and popped it but it was fun
builtmotor,20psi,need i say more?
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Re: GT28R, 7psi, stock internals, 230hp

Post by rn240sx »

adamky wrote:
coldfire07 wrote:So, after two years of having a KA-T and not knowing power/AFR,
I just noticed this part. So, for two years you've been running without a wideband in the car?
I did also...
But i had an egt probe in the collector which didnt help too much but it was something..
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coldfire07
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Post by coldfire07 »

Wow, replacing an o2 sensor made all the difference in the world. I no longer have to disconnect my battery every time I get out of the car to clear the ECU adaptation. Finally gave me the confidence to install the manual boost controller I've had lying around for over a year.

Going to take it one step at a time since I don't want to blow this engine, went from .4bar to around .55bar now. Will raise it slightly every couple of days making sure it's holding the calibration. Might also be a good time for one of those overboost protection thingies.

Planning on going for .7 bar which is 10.2 PSI. Pretty sure that a stock engine can handle that which should put me in the 250+ HP range, hopefully.
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Re: GT28R, 7psi, stock internals, 230hp

Post by TwoForties »

Sorry to Resurrect an old post but what clutch are you using?
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