Best way to choke a 408 N/A..... unported GMPP L92 Intake FTL!
#81
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I am sold on the fact that the intake needs work. It does not distribute evenly, and I would assume by porting it properly in the front for more air to move forward you can compensate for the lack of flow to the front 2 runners. I dont think the short turn effects a smaller cube motor as much as one would think, regardless the elbow flows much better than a composite. The increased runner length is definately a concern, but isnt the point of using the elbow to gain more runner volume back that the intake lost?
Now, if you were to put a blower or turbo in it, you'd probably be fine, but naturally aspirated (with or without nitrous), you will continue to have woes with the path you're planning. In fact, I would not even consider nos until you get it running right n/a.
#83
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You are making some grave assumptions that will cost you time and money. As others have explained, the intake flow capability is not the problem, nor is the flow capability of the elbow. But the eblow is 90+% of your problem. You are not going to be able to port your way out of it. Your distribution issues are directly related to what the elbow is doing to the air as it enters the intake manifold plenum. You are going to have to change parts to fix it. Do yourself a huge favor and get a hold of a 2" carb spacer, take your car to your local chassis dyno guy, dyno it as it sits and then try it with the 2" spacer. The spacer will essentially fix the short turn issue (not 100%, and not perfectly, but much better) and show you that the elbow is in fact the problem. I know you can't run it like that, but it'll prove my point.
Now, if you were to put a blower or turbo in it, you'd probably be fine, but naturally aspirated (with or without nitrous), you will continue to have woes with the path you're planning. In fact, I would not even consider nos until you get it running right n/a.
Now, if you were to put a blower or turbo in it, you'd probably be fine, but naturally aspirated (with or without nitrous), you will continue to have woes with the path you're planning. In fact, I would not even consider nos until you get it running right n/a.
I already have a plate on it for nitrous.
#85
Come on man. You know there was no mathematical calculations designed into that elbow...It was made simply to clear the cowling on a stock hooded car.
#88
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combination of 265-270cc intake ports, valve shrouding from only a 4.030 bore and 2.125 intake valve combined with only 7000 rpms and a restrictive front end make for a weak combination. I hope that it does decent on the bottle.
#90
I have contemplated that exact elbow for my next setup. One thing that jumped out at me as a possible shortcoming is the abrupt transition from round to square and the resulting diffusion loss.
If it were me I would spend a little time with Bondo or JB Weld and fill in those corners and create a taper from the tb opening towards the bend. You got nothing too lose and some other people could benefit from your R&D.
If it were me I would spend a little time with Bondo or JB Weld and fill in those corners and create a taper from the tb opening towards the bend. You got nothing too lose and some other people could benefit from your R&D.
#91
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my car just made 455/515 with a retune and different converter. Heads up... honestly I think that if it had wheels other than the 42lb TT2/28tall combo and a 6 speed it would make 490/530 or so..... not too shabby. Sent the car to a lil speed shop in Lewisville and they spent some time fixing loose ends and getting it ready for goin fast.
#92
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Don`t feel bad. I`ve got a ton of money in my heads and my fast stops me at 5400rpms all the way threw! I could have gotten more with a better intake set-up. But thats life!! When something better comes along I will switch to it! Until then my numbers in sig are all I have( A4 tranny). I bet yours runs strong!! Good Luck!
P.S. Greg Good did my heads and fast intake so you know they flow there *** off!!
P.S. Greg Good did my heads and fast intake so you know they flow there *** off!!
#94
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Don`t feel bad. I`ve got a ton of money in my heads and my fast stops me at 5400rpms all the way threw! I could have gotten more with a better intake set-up. But thats life!! When something better comes along I will switch to it! Until then my numbers in sig are all I have( A4 tranny). I bet yours runs strong!! Good Luck!
P.S. Greg Good did my heads and fast intake so you know they flow there *** off!!
P.S. Greg Good did my heads and fast intake so you know they flow there *** off!!
To be honest, I am very impressed with the gains! If you take he 75rwhp for drivetrain loss, with those huge port heads it would be about 490-520 or more on a typical 6 speed car. Not bad for a restrictive intake, 236 duration cam and 265-270cc intake port heads if you ask me.
#95
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Those numbers sound more like it. That A3 w/ stall will rob HP on the DYNO. My guess for My car was arund 470rwhp and 520rwtq so you are right there on what the combo should do.After all it is a N2o motor so it will shine on the bottle. Get some drag stars for the rear and I bet you go Mid to high 6,s NA in the 1/8. Good Luck.
#96
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Those numbers sound more like it. That A3 w/ stall will rob HP on the DYNO. My guess for My car was arund 470rwhp and 520rwtq so you are right there on what the combo should do.After all it is a N2o motor so it will shine on the bottle. Get some drag stars for the rear and I bet you go Mid to high 6,s NA in the 1/8. Good Luck.
#98
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^ true, the elbow is an easy fix due to fittment issues but, IMO, the only way to feed those heads is a 4brl tb, accufab, wilson, fast, 1200+ cfm should do it. The air speed in those chambers is slow enough, IMO elbows are restricting airflow plus how hot does that elbow get? Good on forced induc. but laggy on na's. The ultimate if cash is not an issue is a kinsler. Youve already cut the cowl so ur comitted. You can try a carb cap or cover from the likes of procharger or others, to fab a filter. Might be able to save the hood that way. I also beleive that the 4brl tbs helps with intake air temps.
Last edited by 3fingas; 05-27-2008 at 03:33 PM.