Sr20 det- blowing out the spark/rev limiter symptoms problems?

[328iTe36]

So me and my friend spent all weekend putting his SR20DET and transmission in his S14 kouki, he installed a Garret GT28 on it and he is having problems now.

The car is running a stock tune, boost controller is a greddy profec b spec 2 I believe and when he pushes anything higher than 6psi, at about half throttle and 4000 rpms seems like he hits the rev limiter or he blows out the spark, the wideband sensor just went bad so we don't know if the car is running lean or what, but it's something the car wouldn't do when he had the stock turbo on it.

Any input would be awesome guys.

Thanks a lot. Also, let me know if you guys need more details, I have tried to described it the best since it's not my car and I'm not the one who drives it but I have put a lot of time and effort into this car and I would love to see it run perfect.

Thanks again.

[jspaeth]

Wow your friend really needs to do some reading.

You can't just slap a bigger turbo on a stock car with stock injectors and stock MAF and expect it to work.

[Boostedkouki]

Did you gap the sparkplugs? If you didn't that might be 1 of your problems.

[shadowcorp]

Originally Posted by jspaeth

Wow your friend really needs to do some reading.

You can't just slap a bigger turbo on a stock car with stock injectors and stock MAF and expect it to work.

Yea except big turbo or not it's still freaking out in a boost range that's normal for the small turbo.

[GroundPerformance]

T28 Big turbo... Check plug gaps and Ground connections.

[shadowcorp]

Originally Posted by GroundPerformance

T28 Big turbo... Check plug gaps and Ground connections.

Didn't really mean big lol, just larger than stock.

[anfitch2k5]

Boost leak.

[95zenkisr20]

i have checked for boost leaks.. there are none that i can find...seems like its running rich.... (checked plugs.. stupid innovate broke) im using a greddy profec b spec 2 and my read out is saying that i am making 6 psi of boost but the power just isnt there.... when you up the boost it makes 6 psi still and then just bogs down.... still no power any help would be appreciated

[airhead]

[QUOTE=328iTe36;3625853when he pushes anything higher than 6psi, at about half throttle and 4000 rpms seems like he hits the rev limiter [/QUOTE]

Sounds like a boost leak. check all couplers replace with T-bolt clamp. Pull on and all IC piping make sure its all tight.

I had this same problem i had cheap regular c-clamps and had a leak. seamed like it hit the rev limiter. Replaced all clamps with t-bolt. problem solved.

[airhead]

also check MAF wire all the way to the ecu

[VQMaxFan]

exhaust leak between manifold and turbo?

+ what everyone else mentioned.

[BMXer91331]

does it have the shakes? check the coils and fuel injectors disconnect one by one if you disconect one and the engine doesnt change then theres your problem

[airhead]

the other day i was having boost issues. i kept checking over and over for every possible problem it turns out the vacumm line for the wastegate was pinched inbetween the coolant hose and fan shround.
just throwing that out there it could be many things you might just skipped pull out all the vacumm lines and inspect if you have to

[jspaeth]

Originally Posted by shadowcorp

Yea except big turbo or not it's still freaking out in a boost range that's normal for the small turbo.

Dumbass, who cares about boost? You know nothing about turbocharging obviously if you make a statement like the one above.


A T28 at 7 psi probably makes 240 hp or so, which is what a T25makes at like 14 psi....meaning the bigger turbo flows the same amount of air at a lower psi than the small turbo at more psi.

So that being said, YES you can max out stock injectors/MAF on a T28 in the 7-8 psi range.

[NMs14.5kouki]

Originally Posted by jspaeth

Dumbass, who cares about boost? You know nothing about turbocharging obviously if you make a statement like the one above.


A T28 at 7 psi probably makes 240 hp or so, which is what a T25makes at like 14 psi....meaning the bigger turbo flows the same amount of air at a lower psi than the small turbo at more psi.

So that being said, YES you can max out stock injectors/MAF on a T28 in the 7-8 psi range.

With all this^ being said, I am having a similar problem on my car, only happens under load in 3rd, 4th, 5th gear, my car isnt running on stock stuff, and shouldn't be blowing out sparks but it sounds like it is. would maxing out the maf give similar symptoms as stated in the op's original post?

[shadowcorp]

Originally Posted by jspaeth

Dumbass, who cares about boost? You know nothing about turbocharging obviously if you make a statement like the one above.


A T28 at 7 psi probably makes 240 hp or so, which is what a T25makes at like 14 psi....meaning the bigger turbo flows the same amount of air at a lower psi than the small turbo at more psi.

So that being said, YES you can max out stock injectors/MAF on a T28 in the 7-8 psi range.

.... Really....... I know T28s flow more air that's why they can make higher boost numbers and hence higher HP. They may be able to build the same boost faster but 7psi is 7psi. If there is more air then there is higher boost. You don't get more power out of 7psi just cause it's a bigger turbo. On the other hand sensors can have a fit about the higher volume of air being taken in under certain situations.

[codyace]

Originally Posted by shadowcorp

.... Really....... I know T28s flow more air that's why they can make higher boost numbers and hence higher HP. They may be able to build the same boost faster but 7psi is 7psi. If there is more air then there is higher boost. You don't get more power out of 7psi just cause it's a bigger turbo. On the other hand sensors can have a fit about the higher volume of air being taken in under certain situations.

Well McFly, If you know T28's flow more air, then why do you think 7psi is 7psi is 7psi across the board? Boost is not a measure of airflow.



While possibly unrelated, check this out as well: How To Tune Your Greddy Profec B spec II - evolutionm.net

[jspaeth]

This is like the dream scenario, where someone who is COMPLETELY wrong insists that they are right.

I LOVE it.