Single Plane Manifold conversion help!!!!!
11-03-2013, 08:15 PM
#1
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Single Plane Manifold conversion help!!!!! I know of a user on by the name of "T/ALT1" and saw his thread on here where he welded his own intake elbow to the 4150 flange and welded a lt1 throttle body mounting plate to make his own elbow...
So my question is, is where do you just buy the flanges and if this member is still active and if anyone would build me one or where can i get the flanges?
this is the link to T/ALT1 who is member on ls1tech here.
https://ls1tech.com/forums/lt1-lt4-m...cs-inside.html
So my question is, is where do you just buy the flanges and if this member is still active and if anyone would build me one or where can i get the flanges?
this is the link to T/ALT1 who is member on ls1tech here.
https://ls1tech.com/forums/lt1-lt4-m...cs-inside.html
Last edited by z28lt1rocket; 11-03-2013 at 08:29 PM.
11-04-2013, 03:27 PM
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i was thinking of doing that but how do you rout the cruise control cables and throttle cable ? because i dont wanna lose the cruise because it still works on my car, and will the cable reach and fit ?
11-05-2013, 05:26 PM
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ok thanks and also do I need to instslll injector bungs or can I just drill the holes for the injecotrs? Im using a 7530 single plan team G weiand intake manifold like this ....
http://www.carcraft.com/techarticles.../photo_11.html
http://www.carcraft.com/techarticles.../photo_11.html
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11-06-2013, 06:14 PM
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yeah I know about the bolt pattern needs to be changed, and thanks is there going to be any noticable power gains going from the stock manifold to this single plain ?
this is my exact combo with everything done:
1994 lt1 with sequential fuel injection (unlike the 1993 batch firing injection)
36lb GM injectors
11.2: 1 compression ration
stock heads but they have been ported and flowed and tested at 260 cfms @ .550 lift and dont fall off, 170 cfms @ .500 lift and start falling off at .550
twin 58 mm TB
pacesetter longtube headers, no cats, borla mouth exhaust
comp cams 280xfi cam (230/236 dur@ .50 575/570 lift cam 113 LSA with 1.6 rr and I am using 1.6 roller rockers)
355 cubic inch (.030 over)
Custom tune done by myself (for simple terms I have it tune for 13.0 : 1 AFR @ WOT with a total 35 degrees of timing from 3000 rpm to 6500 rpms)
and even if I dont gain much power from the single plain conversion, at least it should raise where my motor make peak hp, correct ?
this is my exact combo with everything done:
1994 lt1 with sequential fuel injection (unlike the 1993 batch firing injection)
36lb GM injectors
11.2: 1 compression ration
stock heads but they have been ported and flowed and tested at 260 cfms @ .550 lift and dont fall off, 170 cfms @ .500 lift and start falling off at .550
twin 58 mm TB
pacesetter longtube headers, no cats, borla mouth exhaust
comp cams 280xfi cam (230/236 dur@ .50 575/570 lift cam 113 LSA with 1.6 rr and I am using 1.6 roller rockers)
355 cubic inch (.030 over)
Custom tune done by myself (for simple terms I have it tune for 13.0 : 1 AFR @ WOT with a total 35 degrees of timing from 3000 rpm to 6500 rpms)
and even if I dont gain much power from the single plain conversion, at least it should raise where my motor make peak hp, correct ?
11-06-2013, 08:36 PM
#10
If you feel like that cam is peaking too low then the heads are likely choking it or the springs letting the valves float. That cam with decent heads and valvesprings will make power beyond 6500rpm, likely peak by then but should keep making power. I might look at dialing back that timing a little and see if it helps.
The MAF readings go wonky at high rpm?
The MAF readings go wonky at high rpm?
11-06-2013, 08:44 PM
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no i have not had any problems with the cam or springs I just havent felt like spinning it past that but my main question is, is a single plain intake manifold conversion gonna be worth while or help power wise at all for the combo I have?
11-07-2013, 04:39 AM
#12
not if you are failing to realize it is floating the valves. Even after that few very high effort larger motors actually show gains and you have a modest effort near stock displacement setup.
You are blindly jumping on this bandwagon MUCH too early in the car build process.
You are blindly jumping on this bandwagon MUCH too early in the car build process.
11-07-2013, 05:26 AM
#13
There's a thread somewhere that shows the only spot you'll start seeing gains is over like 6800 or something, with less everywhere else. If you were going to 8000, then yea, do it. But if your on the stock PCM I'm pretty sure it's been agreed its not worth it.
11-07-2013, 11:28 AM
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ok thanks for the advice. and yes I do understand Ill need new fuel lines, injector bungs welded, new holes drilled for bolt pattern, and regulator and such. Ok thanks for the advice on saying its not worth it.