Is this a Bad Idea?!?!?!?!?

[Sideways~S14]

So right now my situation I have a S13 Blacktop running Fmic, Full Turbo Back Exhaust, S14 T28, and HKS Mushroom filter and a stock ECU stock Injectors Etc. I have a GT2871R sitting in my room waiting to be put on the motor. I Plan on keeping my stock exhaust manifold on. Basically I wanna know is it a bad Idea to put the 2871R on even if I plan on running stock boost (7-10psi) on a Stock tune. I could probably get a Safc or something just to throw more fuel in so it doesn't run lean but any input on this would be Great.

[GrilledCheese33]

In my opinion, a car is only as reliable as its tune. Some people get away with their cars running ok untuned, but my suggestion is do it right, do it once. Upgrade fuel and what not then slap the turbo on then. Then go get yourself a tune. I think you would be happier in the end, plus you would know your car is running right and not guessing with an safc if you have enough fuel.

[ciscos13]

im not an expert but i say it wouldnt matter as long as you don't boost over 13psi with those stock injectors. since your maff is the one measuring the air it wouldnt' matter what turbo you have. as long as your not boosting too much that its maxing out your injectors.

[PyR0NiAk]

What people seem to forget is 10psi on one turbo is not the same as 10psi on a larger turbo. I wouldn't put the turbo on until I had injectors and a tune to support them... Also, SAFCs are terrible ideas.

[homeslicej2]

^This. 7-10psi on the 2871 is a lot more flow than 7-10psi on an S14 T28. I wouldn't even run the S14 turbo at any psi without the ECU tuned, larger injectors, larger MAF. The ECU from the factory was programmed for the stock T25.

[stevecorrado]

i ran a s15 turbo with stock setup for a year on 13 pounds and it ran fine once i got a tune and bigger injectors, maf it was 10 times faster. My friend had a 2871r on stock set up but only ran like 10 pounds and it didnt break up. Just run low boost and if it breaks up lower the boost, if you cant afford a tune keep the boost low u will be ok

[PyR0NiAk]

Just because it's not breaking up, doesn't mean you're not doing damage. While I believe what you're saying, I also have to say that I believe your friend got lucky...

It seems every other car in my home town ends up with holes in their pistons because they don't run enough fuel. Their story is always the same... "It was running great!"

[rc1honda]

Just because it's not breaking up, doesn't mean you're not doing damage. While I believe what you're saying, I also have to say that I believe your friend got lucky...

It seems every other car in my home town ends up with holes in their pistons because they don't run enough fuel. Their story is always the same... "It was running great!"

This right here. A/F ratio is only one factor in a sound running engine. Timing is huge. Without the proper support the motor can be on the stock timing map. While you might not be running dangerously lean, the timing is to far advanced for the A/F mixture. You can still have knock and be running super hot exhaust temps when timing is to far advanced even while in a relatively rich A/F ratio such 12.5. or 13.

[ciscos13]

Just because it's not breaking up, doesn't mean you're not doing damage. While I believe what you're saying, I also have to say that I believe your friend got lucky...

It seems every other car in my home town ends up with holes in their pistons because they don't run enough fuel. Their story is always the same... "It was running great!"

This right here. A/F ratio is only one factor in a sound running engine. Timing is huge. Without the proper support the motor can be on the stock timing map. While you might not be running dangerously lean, the timing is to far advanced for the A/F mixture. You can still have knock and be running super hot exhaust temps when timing is to far advanced even while in a relatively rich A/F ratio such 12.5. or 13.

then what exactly is the maf there for??

[PyR0NiAk]

The MAF can only do so much to help protect an engine. I highly recommend you check out the Engine Tuning forum and read the FAQ at the top.

[rc1honda]

then what exactly is the maf there for??

All a MAF does in interpret metered air as load. So if its sucking in a lot of air it tells the ECU that it under high load. And will pull timing when the load gets to high in the stock ecu range. But these are not factory parts we are talking about. And a MAF is a rudimentary load meter at best. Thats why all big power setups use Pressure MAP sensors instead, and air intake sensors to measure load and intake air temps. MAFs are unreliable when pushing any kind of real horsepower. If your depending ona MAF to pull timing in order to save your engine you better have a short block ready to build on standby.