stock s13 redtop.... s15 spec r turbo upgrade

[95zenkisr20]

I have a stock s13 redtop with a fresh rebuild and knife crank.. i have a s15 t28 turbo i want to put on.. can i run stock injectors and maf ... or will i max out my maf and need to get bigger injectors.. ( also i am running a walbro 255)

any help would be great thanks

[240Zfunahollic]

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[95zenkisr20]

i have been.... i dont post unless i cant find the info i need

[eklips3]

depends how much boost your running.
i think it should be ok if you dont go crazy with the boost levels

[herbieS13]

brother used to run a similar turbo and stockinjectors but a z32 maf at the time i believe and had no problems when he cranked the boost up to roughly 14psi

[sil80 monster]

id go with a z32 maf and 480cc s15 injectors with a tune

[240lab]

depends on your boost level. but one way you can check is if you have a dvom connect one lead to the signal side of the injector (witch is not the common colored wire on all the injecors) and the other to ground and set the dvom to read % and min/max mode this will tell you the duty cycle of the injector the min max function will show you the highest % and the lowest of the duty cycle for that injector people generaly say not to go past 85%. another thing you can do is find the signal wire on you maf and back probe that and ground the other lead set the dvom to read v and set the min max function again and run the car through the whole rpm range and see if your maf is pegging 5v if it is then back off the boost cause your maxing out your maf. this is what i did im running a gt2871r .86 turbine houseing on stock injectors and maf on 7 psi and i was maxing out the maf and the injectors where at 92% duty cycle so a cheap way for me to fix that for now since standalone is on backorder is uped the fuel pressure did some wot runs watched the wideband and keep adjustiing till i got around 11.5 to 1.

this is just my 2 cents in what i have done anyone else you might be able to add to or explain better feel free. GL

[codyace]

A stock t25 litearlly maxes the MAF, Injectors, and Fuel pump at the same time, roughy 13/14 psi

So if you take the cooresponding airflow, I'd say at roughly 7 or 8 psi, you'd probably max the stock stuff as it was.


Bottom line, put a boost controller on her, and enjoy it. Sure it'll run out of steam up top, but a S15 turbo won't even begin to make good power at 7 psi.