383 TPI Breathing issues
#4
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Car: 1986 IROC
Engine: 355" TPI
Transmission: 700R4
Axle/Gears: 3.42
Re: 383 TPI Breathing issues
Its not as bad as some claim but you should expect to make peak power somewhere near 5K.
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Car: 1988 Camaro
Engine: 383 Stroker
Transmission: Probuilt 700 R4
Axle/Gears: 3.73
Re: 383 TPI Breathing issues
its all how you build it. On my car it makes power until around 6400 rpm. It peaks at 5700 and stays fairly level until 6400
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Car: 1990 Trans Am
Engine: Lb9
Transmission: factory T5
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Re: 383 TPI Breathing issues
Ah! I searched for quite some time trying to find that link, it's going in the bookmarks this time.
#7
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Re: 383 TPI Breathing issues
TPI can be made to flow quite well. Don just had an Accel TPI intake manifold ported and it flowed 326cfm and 331 cfm between the ports. Stick on a set of opened up and siamesed SLP runners or a opened up Super Ram and you have a system that can support up to 600 hp.
By the way some of us feel the Accel TPI intake manifold is the best one to start with outside of the First. Unfortunetly it is no longer made and has to be bought on the previously owned market.
By the way some of us feel the Accel TPI intake manifold is the best one to start with outside of the First. Unfortunetly it is no longer made and has to be bought on the previously owned market.
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 383 TPI Breathing issues
I run in my new 383 with my old TPI setup ; siamised base , SLP's and ported plenum .It spun over 6K but I know from the intake comparison above the power would have been flat over 5K. Impressive bottom end, traction problems on ET streets
Swapping to a HSR on the same tune dropped me straight away from 12.7 (A4 3.07) down to 12.3 and helped off the line because it dialed out some of the bottom end torque ; not that you would notice
Swapping to a HSR on the same tune dropped me straight away from 12.7 (A4 3.07) down to 12.3 and helped off the line because it dialed out some of the bottom end torque ; not that you would notice
#9
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Car: 87 iroc z
Engine: 460
Transmission: t-200
Axle/Gears: 4 10s
Re: 383 TPI Breathing issues
i have a 450cu.TPI i ran accel d.f.i , 83lb injects, with a comp cams, heddman heads justable regfully ported plenum an runners, with a 64mm body airfoil sounds dumb but also the tps throttle enhancer,also with the msd 7al hooked to thepro power coil mine peaks at bout 7000 rpm
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 383 TPI Breathing issues
i have a 450cu.TPI i ran accel d.f.i , 83lb injects, with a comp cams, heddman heads justable regfully ported plenum an runners, with a 64mm body airfoil sounds dumb but also the tps throttle enhancer,also with the msd 7al hooked to thepro power coil mine peaks at bout 7000 rpm
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Car: 87 iroc z
Engine: 460
Transmission: t-200
Axle/Gears: 4 10s
Re: 383 TPI Breathing issues
AFR L98,195cc comps. beehive springs, with the mag. comp rockers. its a comp cam i for get the lobe, lift an dar. off the top off my head lol
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Car: 1991 Formula Firebird
Engine: L98 with headers/exhaust
Transmission: 700R4
Axle/Gears: 3.23 10-bolt
Re: 383 TPI Breathing issues
I had the bone-stock TPI on top of a mild 383 in my 1990 Vette. It only made 250rwhp, but held 300+rwtq from 1800-5200rpm. The party was over by 5400rpm, though...
It was a really fun street engine coupled with the 700R4 and would just liquifey the tires at any provocation. It may not have been the fastest car, but it was giggle-inducing stupid fun...
It was a really fun street engine coupled with the 700R4 and would just liquifey the tires at any provocation. It may not have been the fastest car, but it was giggle-inducing stupid fun...
#20
Supreme Member
Re: 383 TPI Breathing issues
Maybe it used to be TPI and has a Miniram or a singleplane intake now,,, but it's not doing with a TPI - long runner intake. It's physically impossible as in the PHYSICS involved make the long runners incapable of making peak power at 7000 with a 450cid engine. Period.
#21
Re: 383 TPI Breathing issues
Somebody just got destroyed by the scientist.
#22
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Re: 383 TPI Breathing issues
Originally Posted by TA
I have a stealth bomber in my backyard, too, but is invisible in the photos I take of it, because it's Stealth!!
http://www.youtube.com/watch?v=YLyyPCbxnIU
#23
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Car: 87 iroc z
Engine: 460
Transmission: t-200
Axle/Gears: 4 10s
Re: 383 TPI Breathing issues
lol i never said that my intake had the runner an stock plenym on it ,im using the miniram system
#28
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Re: 383 TPI Breathing issues
But if you want TPI looks and bigger inch motors and wish to go fast, then doing what Dyno Don and JerryWho and others have done is the only way.
#33
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Re: 383 TPI Breathing issues
Hi Orr
I think they will in do time. One thing we have found out over time is the Accel version of the TPI intake manifold is the best one for most. It has the most bang for the buck with any additional work. I put the First in another category.
I think they will in do time. One thing we have found out over time is the Accel version of the TPI intake manifold is the best one for most. It has the most bang for the buck with any additional work. I put the First in another category.
#35
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Re: 383 TPI Breathing issues
Basically open up the after market intake manifold (original Accel best outside of First) to flow around 330 cfm. Siamese, add some weld to SLP runners and open them up to around 1.78" diameter. Leave 1 to 2" of runner left where it bolts onto the intake manifold. Open up the factory plenum to match the runners and maybe fit a 58mm throttle body.
My TPI combination makes peak power at 6400rpm. Just ran a 12.09@113+ over at California Raceway in Fontana in terrible air with a density altitude of 3100ft plus. This is an A4, 355 cubic inch motor and a heavy fully loaded GTA.
My TPI combination makes peak power at 6400rpm. Just ran a 12.09@113+ over at California Raceway in Fontana in terrible air with a density altitude of 3100ft plus. This is an A4, 355 cubic inch motor and a heavy fully loaded GTA.
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Car: 91 B4C/91 RS 305
Engine: L98 and L03
Transmission: 2xTH700R4
Axle/Gears: 3.23 LSD/2.73 Open
Re: 383 TPI Breathing issues
ahh man I thought you said it looked stock. siamesed runners≠look stock.
and just to reiterate. mini-ram is not tpi
and just to reiterate. mini-ram is not tpi
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