Hey! So I am waiting for the 2.4 L LE5 manifold swap. Already have 36 lb injectors. Some friends were telling me its a must to have an AEM UEGO WIDEBAND gauage with sensor specially when you start tuning your car. If I got the adaptor from HAHN to mount a AFPR on my 02 fuel rail and had a wideband o2 sensor, I could potentially mix up the fuel and air correct with the FPR. With no laptop or HPT, I don't see how also without a DYNO how I would for example get tuned to make more power at 7 K for instance instead of my current 6500 RPM (max hp and tq). Once I do get re-tuned with HPT with the mani in, I don't think I need a AFPR right now either. Anyone can tell me maybe If I should have both? No super HP mods planned anytime soon.
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Anyone?
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You could possibly pull it off, but it's gonna be a royal pain, and I would imagine that if you did pull it off for street driving, at WOT you'll have issues. You don't need to install an AFPR to tune (though it makes life easier cause it's adjustable), and you don't need to permanently install the wideband, you just need it during the tune. If it were me (and I'm actually doing exactly those mods plus a few next weekend), I'd use HPT no matter what...there's so much more that you'll get out of the engine if you tune it the right way, plus there's computer settings you can mess with to get even more power out of the car.
+1
I would just get it retuned with the wideband and HPT. At least you know your injectors will be up to the task. An AFPR is more like an "offset" and generally is not an rpm dependent enrichment. You will correct your lean top end, but will over richen the midrange.
Judging from my own experience, by bolting on the LE5 mani, you will be leaner from about 4500-7000 rpm and a tad richer from 2000-3000rpm. Do you know what your PE delay is currently set to? I could see you getting away with the AFPR if your PE delay is set relatively high (like 5k rpm)
Thanks for the advice. So, get a wideband 02, the mani and TUNE? If I don't use a wideband, I will not be getting the right amount of WHP? Can I borrow one and tune with it then go back to narrow band (stock 02 sensor?).
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You sure can...that's how quite a few people do it until they can afford/justify one. And it's not so much that you won't be getting the right amount of power, just that you won't be able to optimize the tune without the use of a wideband (well I guess you could, but it'd take a hell of a lot of time and wouldn't be worth it). More along the lines of you won't get as much power as you could most likely.
Edited 1 time(s). Last edited Saturday, September 12, 2009 3:51 PM
I need more motivation to get this project done. I have 152 WHP. Tell me I'm getting at least 165 WHP with this setup? The 152 to the wheels was dyno'd without the 36 lb injectors in. I was at 99 percent duty cycle on the stock injectors at this max whp I got! So bigger injectors, LE5 manifold= 13 whp possible?
Throw in some numbers. This is my "PASS TIME" version of the show lol. I will definitely post up on the gains I got once its done!
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This setup includes getting re-tuned with HPT and using a wideband 02 sensor! If you guys throw out some 15 -18 or more whp I'll probably get it done this weekend lol
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Anyone??
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I don't think anyone has actually dyno'd at this point in their build. Go to Crateenginedepot and look at the page for their kit, there's some dyno sheets on there about just what the le5 mani will do.
Thanks. I did do that and found a video with a cobalt 2.2 before and after the 2.4 mani swap. 15-18 hp I believe was the gain. Reason why I mentioned those numbers above . Not sure if that was to the wheels. The cobalt had an intake and exhaust only I think. It might have been to the wheels but with two bolt ons, sounds like a lot! If I get at least 20 to the crank I'll be happy!
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Even if it was 15-18 at the crank, that's still 10+ at the wheels, and you're throwing on bigger injectors, so you'll be able to push it more at the high end and make sure you're running proper afr's. Also, bumping you're rev limiter to 7000 will most likely give you access to a little more top end too...depends on the car and tune. I wouldn't go above 7000rpm for a daily driver on a stock valvetrain though...I know of quite a few people who did 7500, but I just wouldn't trust the springs.
Just do it man! You know you want to anyways lol. Then let us know how it turns out.
lol.. I know right Just DO IT! I will very soon. Thanks for the tip. My rev limiter is set to 7 K right now and I've heard the same thing on stock valvetrain. Maybe I'll do 7100 MAX lol IF I get power that high.
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Oh you will get power that high... the LE5 mani can actually FLOW air and is made for higher rpm... when i had the LE5 manifold i made power all the way to 7k on a stock valvetrain... the powerband will not drop off like it does with the stock manifold as long as your exhaust can flow as well... get your car tuned and have fun...
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Dammnnn Its like that! I can't wait to have some "FUN" then! I think after this mod I can wait a little to do something else because it will be a very noticable gain in performance. Keep me happy for a while.
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