TPI 350 Power
02-19-2009, 09:07 AM
#1
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TPI 350 Power My friend just had a new motor installed in his '87 IROC, and he thinks its the ****. I was curious about how much power is actually going to the wheels.
-Stock ZZ4 Crate Motor, these are 350's right? He keeps calling it a 383
-Edelbrock HI FLOW TPI intake/runner system
-BBK Racing throttle body
-Edelbrock Ceramic Coated headers
-Stock T5 Trans
-Stock differential w/ 2:73 gears??
He thinks it will make 400 HP on a dyno, I say 350 or less. What do you think?
-Stock ZZ4 Crate Motor, these are 350's right? He keeps calling it a 383
-Edelbrock HI FLOW TPI intake/runner system
-BBK Racing throttle body
-Edelbrock Ceramic Coated headers
-Stock T5 Trans
-Stock differential w/ 2:73 gears??
He thinks it will make 400 HP on a dyno, I say 350 or less. What do you think?
02-19-2009, 10:10 AM
#2
The factory hp #s for the zz4 was at the flywheel with a carb and it was 355hp and 405 torque. With the long runner intake he might be losing a little hp and his torque is coming on earlier and might be a lil more than the factory rating.
400 hp on a chssis dyno is a no go. You are more correct, he is somewhere around 350 hp at the wheels. Those 2.73's are killing him, he needs to put sum 3.42's back there.
If he put on a Holley stealth ram it would have a better powerband.
I have seen a tpi vette with one of these crate motors with headers run 12.60 at the track on some stickies
400 hp on a chssis dyno is a no go. You are more correct, he is somewhere around 350 hp at the wheels. Those 2.73's are killing him, he needs to put sum 3.42's back there.
If he put on a Holley stealth ram it would have a better powerband.
I have seen a tpi vette with one of these crate motors with headers run 12.60 at the track on some stickies
02-19-2009, 10:15 AM
#3
355 HP is rated w/ no acc. drive as well. Figure in that and drivetrain loss... I bet it does mid 200's at best (250-260), maybe 280-ish on a generous dyno. TPI isn't know for big HP #'s on the dyno. They are dump truck motors and make crap tons of TQ.
Now they do have a ZZ383 crate engine, it is rated 425 HP. Possibly he has that in his car? That would be even more choked up than a ZZ4 with the TPI on it.
Now they do have a ZZ383 crate engine, it is rated 425 HP. Possibly he has that in his car? That would be even more choked up than a ZZ4 with the TPI on it.
02-20-2009, 07:44 PM
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Ya thats what I thought, the TPI would choke down the power vs. a single plane and nice carb. He had a 305 TPI stock, blew it up eventually (high miles) and his dad bought the motor and goodies all brand new from summit, and had a shop install it all. Im not sure what gears are in it, I was guessing. It might already have 3:42's in it? Anyways, he doesn't know what it is, he says its a ZZ4 crate AND a 383, so I need to find out from his dad for sure what it is. He talks about how it makes 400 HP or more, and I call BS. I told him to do and LS1 or LS2, and a six speed, especially if dad is buying. Anyways, I can't wait to get him up on a dyno to see what happens.
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02-21-2009, 01:22 PM
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Coming from a fellow thirdgen guy, im thinking he will have 300rwhp at best. IF he replaced cam, heads ect then its a whole new ballgame, but everybody is correct, TPI kills horsepower....go HSR!!
02-21-2009, 08:27 PM
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mine holds up just fine 355 sbc, stock never apart t-5 on slicks and spray and made about 90 passes and never broke anything while hanging the hoops on the air, but maybe my trans was build on a friday and on drink beer at work day LOL
02-26-2009, 11:25 PM
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The ZZ4 engine is 350ci, if he thinks its a 383 then he's full of crap or he got lied to.
I had a ZZ4 clone, with the ZZ4 cam and ported ZZ4 heads. It made 282 RWHP and 380 RWTQ thru a T5 transmission. It ran a best of 13.23 @ 107.50
I had a ZZ4 clone, with the ZZ4 cam and ported ZZ4 heads. It made 282 RWHP and 380 RWTQ thru a T5 transmission. It ran a best of 13.23 @ 107.50
02-27-2009, 12:03 AM
#17
i have had many 5.7s w/ T5 set ups and broke many trannies granted i am VERY HARD on trannies when racing... you must have some serious magic workin for you! i tried everything known i had a very nice clutch that really upset the T5 as well.
02-27-2009, 12:12 AM
#18
[QUOTE=Kevin91Z;11139788]The ZZ4 engine is 350ci, if he thinks its a 383 then he's full of crap or he got lied to.
it could be this
http://www.sdpc2000.com/product/SDZZ...ripEngine.aspx
it could be this
http://www.sdpc2000.com/product/SDZZ...ripEngine.aspx
