Why is my 382 so slow?
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
Why is my 382 so slow? Car is a 98 z28 with a mildly built 382 stroker with 3.73s. it cruises and idles wonderfully but its slower than a 14 v6 camaro and idk whats going on and need some help!
Build:
LS1 Block
Summit Pro LS rotating assembly 10.5:1 CR
244/250 .612/.613 112lsa
#42 gtp injectors
320lph fuel pump
LS1 intake
PRC 2.5 5.3 heads milled to 58cc
Mail order tune
I thought maybe it'd be the ls1 intake but surely it wouldn't restrict it that much would it?
Build:
LS1 Block
Summit Pro LS rotating assembly 10.5:1 CR
244/250 .612/.613 112lsa
#42 gtp injectors
320lph fuel pump
LS1 intake
PRC 2.5 5.3 heads milled to 58cc
Mail order tune
I thought maybe it'd be the ls1 intake but surely it wouldn't restrict it that much would it?
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 703
From: Mississippi
Car is a 98 z28 with a mildly built 382 stroker with 3.73s. it cruises and idles wonderfully but its slower than a 14 v6 camaro and idk whats going on and need some help!
Build:
LS1 Block
Summit Pro LS rotating assembly 10.5:1 CR
244/250 .612/.613 112lsa
#42 gtp injectors
320lph fuel pump
LS1 intake
PRC 2.5 5.3 heads milled to 58cc
Mail order tune
I thought maybe it'd be the ls1 intake but surely it wouldn't restrict it that much would it?
Build:
LS1 Block
Summit Pro LS rotating assembly 10.5:1 CR
244/250 .612/.613 112lsa
#42 gtp injectors
320lph fuel pump
LS1 intake
PRC 2.5 5.3 heads milled to 58cc
Mail order tune
I thought maybe it'd be the ls1 intake but surely it wouldn't restrict it that much would it?
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
Trending Topics
Thread Starter
Teching In
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Last edited by THE CALIX; Jun 14, 2020 at 08:26 PM.
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TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 703
From: Mississippi
~ Get rid of the intake ASAP. You need a fast 90 or better.
~ Get a real Tune.
~ Get a 23X duration cam
~ bump the compression ratio up
You never mention was the car automatic or 6 speed. If the car is a 6 speed you go need 4.1X gears minimum and if you are automatic then s 3000 stall isn't going to cut it eithier. Several things to look at here....
~ Get a real Tune.
~ Get a 23X duration cam
~ bump the compression ratio up
You never mention was the car automatic or 6 speed. If the car is a 6 speed you go need 4.1X gears minimum and if you are automatic then s 3000 stall isn't going to cut it eithier. Several things to look at here....
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
~ Get rid of the intake ASAP. You need a fast 90 or better.
~ Get a real Tune.
~ Get a 23X duration cam
~ bump the compression ratio up
You never mention was the car automatic or 6 speed. If the car is a 6 speed you go need 4.1X gears minimum and if you are automatic then s 3000 stall isn't going to cut it eithier. Several things to look at here....
~ Get a real Tune.
~ Get a 23X duration cam
~ bump the compression ratio up
You never mention was the car automatic or 6 speed. If the car is a 6 speed you go need 4.1X gears minimum and if you are automatic then s 3000 stall isn't going to cut it eithier. Several things to look at here....
Intake and tune are on my top priority list. Yes I need a better cam but it should work just fine for the time being. Nothing serious just a fun street car.
TECH Fanatic
Joined: Jan 2017
Posts: 1,758
Likes: 442
Yeah sadly has the 4l60e with an fti 3800 stall. With the way things are now a days moneys tight so I'm having to work with what I have just trying to get pointed in the right direction.
Intake and tune are on my top priority list. Yes I need a better cam but it should work just fine for the time being. Nothing serious just a fun street car.
Intake and tune are on my top priority list. Yes I need a better cam but it should work just fine for the time being. Nothing serious just a fun street car.
what pistons? Are you running a hot wire kit to help power the fuel pump? If on a budget a used fast 92 is an excellent option. I'd go 15 degrees smaller on the cam. Heads are fine. And these tuners want more money for a 98 tune? What a bunch of hacks. Should be no price difference in tuning it, just has some drawbacks to it that can make it more challenging to get right with big cams and less rotating mass. It's just a slower computer so it won't compensate for these things as well.
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
what pistons? Are you running a hot wire kit to help power the fuel pump? If on a budget a used fast 92 is an excellent option. I'd go 15 degrees smaller on the cam. Heads are fine. And these tuners want more money for a 98 tune? What a bunch of hacks. Should be no price difference in tuning it, just has some drawbacks to it that can make it more challenging to get right with big cams and less rotating mass. It's just a slower computer so it won't compensate for these things as well.
No, I don't. When purchasing the fuel pump I had no idea what all to get as this is my first real build (something other than just cam and exhaust) but after reading more and asking questions a hot wire kit and a few more things are on my list to get asap.
Yeah most dyno sessions around here are $600 but its like every place I talk to want $950 after I mention the 98 ECM. Although I have talked to some smaller tuning shops that would do it for 400 but I don't know of I can trust them enough.
TECH Regular
Joined: Jul 2019
Posts: 421
Likes: 71
From: Tasmania Australia
I just had my LS1 tuned for $440 here in Australia he spend close to 4 hrs on it dynod and road tuned it, but some cams are hard to tune, I'd recommend using a cam that's known to be easy to tune as that's where the costs can go up. But if yours is already running well it might not cost much to tune. You will need good heads to get the most out of that cam, or just go for much milder cam and go for big torque and dont worry about peak numbers, then the heads won't matter nearly as much.
I agree some things on the car are not optimal but it still should run pretty well with that much motor and a 3800 stall. I had bolt ons only with a 3800 stall and would kill a v6 camaro.
The tune would be a major concern, and also making sure the basics are good (tune up, fuel filter, fuel pressure etc) and if all those things are good the cam could be off timing, or the tune is just so bad it's not working out. You really need some info to help sort this out though like the timing, air fuel ratio at wide open, be nice to know what it's actually putting down to the tires too.
In other words you could get by with that setup if need be due to budget, we've all been there. And if you really want it to be the best it can be then yeah I'd look at a different cam and intake, but I get the feeling something else is going on here.
The tune would be a major concern, and also making sure the basics are good (tune up, fuel filter, fuel pressure etc) and if all those things are good the cam could be off timing, or the tune is just so bad it's not working out. You really need some info to help sort this out though like the timing, air fuel ratio at wide open, be nice to know what it's actually putting down to the tires too.
In other words you could get by with that setup if need be due to budget, we've all been there. And if you really want it to be the best it can be then yeah I'd look at a different cam and intake, but I get the feeling something else is going on here.
I'm not going to read the replys so If this has been covered sorry lol
The whole combo is a mess . Not being rude just honest.
Low compression. -15cc dish? Good lord lol
Massive cam
Horrible intake
Email tune on a 98 ecu
What headers/exhaust?
Guarantee a tune will gain over 100 hp by itself.
Ditch that cam, ditch the intake, swap out the pistons if you want to make good all motor power. The heads you have seem to be the best part of the build
The whole combo is a mess . Not being rude just honest.
Low compression. -15cc dish? Good lord lol
Massive cam
Horrible intake
Email tune on a 98 ecu
What headers/exhaust?
Guarantee a tune will gain over 100 hp by itself.
Ditch that cam, ditch the intake, swap out the pistons if you want to make good all motor power. The heads you have seem to be the best part of the build
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
Thread Starter
Teching In
Joined: Aug 2019
Posts: 15
Likes: 3
I'm not going to read the replys so If this has been covered sorry lol
The whole combo is a mess . Not being rude just honest.
Low compression. -15cc dish? Good lord lol
Massive cam
Horrible intake
Email tune on a 98 ecu
What headers/exhaust?
Guarantee a tune will gain over 100 hp by itself.
Ditch that cam, ditch the intake, swap out the pistons if you want to make good all motor power. The heads you have seem to be the best part of the build
The whole combo is a mess . Not being rude just honest.
Low compression. -15cc dish? Good lord lol
Massive cam
Horrible intake
Email tune on a 98 ecu
What headers/exhaust?
Guarantee a tune will gain over 100 hp by itself.
Ditch that cam, ditch the intake, swap out the pistons if you want to make good all motor power. The heads you have seem to be the best part of the build