3 questions for the experts.
- Thread starter 1sty
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smp3000 said:So has the pump helped you? Still at 6psi?
Still at 6 psi for now. Waiting on motor mounts, clutch, flywheel, suspension, to see what the flow rate for the injectors are and what F/M finds out. Pump keeps the pressure constant in the upper RPM ranges where it would dip a little without. I will keep you posted. A buddy of mine is going to split the cost of a wideband o2 with me since we need one for the Vette testing anyway.
K
Keith@FP
One comment about using an AFPR/FMU for fueling under boost. We've got one turbo customer with 175,000 miles on his engine, boosted since it was new. That's at 8 psi with an AFPR. They're not exactly a "time bomb".
Yes, a dedicated computer does allow you to run more boost and unlock more power. It's what we do for our top-end Miata kits. But a TEC 3 will cost you thousands of dollars and has a fairly involved installation. An AFPR is easy to install, inexpensive and simple to tune - and effective for lower boost levels, up to 8 psi.
We're working on fueling. Part of the problem is that the stock ECU has a huge range of authority to correct rich O2 readings - it doesn't care if the engine's under boost, it wants stoich! So we've got a few things under test right now to fix that.
Keith
Yes, a dedicated computer does allow you to run more boost and unlock more power. It's what we do for our top-end Miata kits. But a TEC 3 will cost you thousands of dollars and has a fairly involved installation. An AFPR is easy to install, inexpensive and simple to tune - and effective for lower boost levels, up to 8 psi.
We're working on fueling. Part of the problem is that the stock ECU has a huge range of authority to correct rich O2 readings - it doesn't care if the engine's under boost, it wants stoich! So we've got a few things under test right now to fix that.
Keith
Thanks for the reply Kieth. That definitly backs up my assumptions of the FPR.
Another aspect of this kit I think needs some clearing up is the intercooler. Many experienced memebers of this board mentioned it too small hinting that its ineffective. I have simply one point of proff that the intercooler is perfect. After smoking a Maxima going, umh... quickly, I held my hand on the I/C pipes. The one from the turbo was about the temperature of the engine. The output tube to the throttle body was almost as cool as the outside air.
The intercooler has very little restriction and very effectivily cools the air hence it is a perfect piece. A larger one would only add restriction and I doubt would magicly cool the air more then the outside temp.
Bring it!
(getsome)
Another aspect of this kit I think needs some clearing up is the intercooler. Many experienced memebers of this board mentioned it too small hinting that its ineffective. I have simply one point of proff that the intercooler is perfect. After smoking a Maxima going, umh... quickly, I held my hand on the I/C pipes. The one from the turbo was about the temperature of the engine. The output tube to the throttle body was almost as cool as the outside air.
The intercooler has very little restriction and very effectivily cools the air hence it is a perfect piece. A larger one would only add restriction and I doubt would magicly cool the air more then the outside temp.
Bring it!
(getsome)
K
Keith@FP
To address those who judge intercoolers purely on size and not on science, we'll be putting temperature probes in ours shortly. I expect we'll see the same things we've seen with the Miata ICs - near-ambient intake temps.
Keith
Keith
The intercooler on the FM kit is probably just the right size for the output of the turbo and the motor size. The reason most people say it's not big enough is because they are used to seeing Nissan Skylines or RX7's with huge front mounts. So therefore they think that is what every car should have because it looks cool. That's stupid. I have a front mount because it was cheap and it looks cool. That is the only reason I have a front mount. I'm positive the one from the FM kit works as good if not better than my old modified Conquest intercooler. But, the only reason to go with a bigger intercooler for our car is if you are going with higher boost, say around 10psi. Then you might need a slightly bigger intercooler. But not much bigger than the FM one. I've seen Linuxracer's intercooler from his FM kit and isn't small. It's not big either, it looks just right. It's not as pretty as something found on some RX7's, but damn, you aren't driving a beast here that needs huge cooling capabilities. You aren't running 15 to 20 psi here. Only 5 to 8.
