Is a tune worth it
#1
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Car: 1991 Camaro Z28
Engine: 305ci
Transmission: 700r
Is a tune worth it
How much would a tune help my lb9 in the quarter mile. Mods are long tube headers, exhaust with no cats, intake porting, refurb ford 19lb injectors from southbayfuelinjectors, and 4.10 gears.
How much would it help on nitrous. Definitely want it to pick up a few tenths when I spray in grudge race.
Does it help a lot at WOT.
Also would a mail order tune be worth it.
How much would it help on nitrous. Definitely want it to pick up a few tenths when I spray in grudge race.
Does it help a lot at WOT.
Also would a mail order tune be worth it.
#2
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Re: Is a tune worth it
Hard to say. Depends on the current state of the motor and how its running and also what factory prom was issued. Gm used several different prom codes throughout the model years and most are similar but there are sometimes small differences here and there
Biggest thing to look for is if knock sensor is picking up anything false. My car was and i ended up disabling the sensor.
Then you gotta look at fuel curve as it sits. Motors tend to run rich from factory and improved air flow can sometimes make it run richer. It may hit a higher maf g/s value and command more fuel. Map car may see closer to true 100 kpa instead of say 90-94 if theres restriction. 100 kpa cell may have more fuel in it
Different injectors have different spray patterns and can require tune tweaks
Alot of variables.
I think customizing fuel and timing curve is always good for some hp in these cars. May not be substantial but def can help and could give you some et reduction
On spray you want to run an external ign box with timing retard to get the most out if it. Tune fuel by jet at first to get it close, then you can make a tune for nitrous only if need be but usually jet alone will get air fuel right
Biggest thing to look for is if knock sensor is picking up anything false. My car was and i ended up disabling the sensor.
Then you gotta look at fuel curve as it sits. Motors tend to run rich from factory and improved air flow can sometimes make it run richer. It may hit a higher maf g/s value and command more fuel. Map car may see closer to true 100 kpa instead of say 90-94 if theres restriction. 100 kpa cell may have more fuel in it
Different injectors have different spray patterns and can require tune tweaks
Alot of variables.
I think customizing fuel and timing curve is always good for some hp in these cars. May not be substantial but def can help and could give you some et reduction
On spray you want to run an external ign box with timing retard to get the most out if it. Tune fuel by jet at first to get it close, then you can make a tune for nitrous only if need be but usually jet alone will get air fuel right
#3
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Car: 1991 Camaro Z28
Engine: 305ci
Transmission: 700r
Re: Is a tune worth it
Car is a 91 so doesn't have maf. Don't know a lot about tuning but from what I understand if that I do get a tune, getting someone to data log(I believe is what you're talking about) and make a tune would be a lot better than a mail order tune, right? I would look into doing it myself but plan on ls swapping in a few years and car is only a 305.
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Car: 1991 Camaro Z28
Engine: 305ci
Transmission: 700r
Re: Is a tune worth it
Well I ordered a tune from custom chips Inc. and I made 1 pass with the tune and one with the stock tune and they were almost exactly the same
Pass 1 with aftermarket tune
1/8:9.06
1/4:14.150
Pass 2 30 min. later with stock tune
1/8:9.05
1/4:14.159
Usually the first pass is the fastest from my experience mainly because of the engine temp. I think. So if I would have done the passes with the stock tune first I believe it would have been maybe a tenth faster.
Overall I'd say it was worth it, $65 for tune and $40 for adapter, much better drivability, and it seemed like it wanted to stall out coming to a stop before.
Pass 1 with aftermarket tune
1/8:9.06
1/4:14.150
Pass 2 30 min. later with stock tune
1/8:9.05
1/4:14.159
Usually the first pass is the fastest from my experience mainly because of the engine temp. I think. So if I would have done the passes with the stock tune first I believe it would have been maybe a tenth faster.
Overall I'd say it was worth it, $65 for tune and $40 for adapter, much better drivability, and it seemed like it wanted to stall out coming to a stop before.
#7
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: Is a tune worth it
Do you do tunes for TBI cars as well? Tuners are getting hard to find. I would love to drop a crate L31 in mine and retain my TBI system if feasible.
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#8
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Re: Is a tune worth it
Didn't mean this to be an advertisement. Yes I can do TBI tuning but the ECM needs a modified socket to be able to accept a normal burnble chip. Also check out Rbob's EBL. You can keep your TBI but it's a much faster and better system than the stock TBI stuff.
#12
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Re: Is a tune worth it
as far as anyone on these forums knows, the 90-92 TPI cars all got the L98 cam, regardless of transmission. So in this case, the stock cam isn't hurting him that badly...
I realize the car has 4.10 gears, but it's a full second and a half quicker than most stock 305 TPI auto cars, and all he's done is gears and exhaust. I'd say it's got the good cam....
I realize the car has 4.10 gears, but it's a full second and a half quicker than most stock 305 TPI auto cars, and all he's done is gears and exhaust. I'd say it's got the good cam....
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: Is a tune worth it
Its damn fast for a 305 is what it is! 76 mph sounds odd though.. Must get to it REAL fast. My old LB9 turned a best 14.76@96 if I remember correctly on the mph. Like 273 gears though. Thing was only in 3rd gear.
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Car: 1990 G92 IROC Z Miniram
Engine: 388cu 6.4 Liters
Transmission: G-Force T5
Axle/Gears: 3.73 Gears
Re: Is a tune worth it
Its damn fast for a 305 is what it is! 76 mph sounds odd though.. Must get to it REAL fast. My old LB9 turned a best 14.76@96 if I remember correctly on the mph. Like 273 gears though. Thing was only in 3rd gear.
#18
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Car: 1991 Camaro Z28
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#19
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: Is a tune worth it
It can be possible if he runs out of motor due to gear
Thnking about picking up a TBI 454 Duallie in ca you can get doug thorley CARB legal headers. Something you can touch up or is it even needed? Dont know if it would want to go a little lean or not
No its not a camaro but same EFI
Didn't mean this to be an advertisement. Yes I can do TBI tuning but the ECM needs a modified socket to be able to accept a normal burnble chip
No its not a camaro but same EFI
#20
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Re: Is a tune worth it
I had 1MeanZ set me up with a custom tune for my 91 350tpi car and it put down 224rwhp on a Mustang Dyno. Only mods done to it besides the tune was a Magnaflow catback exhaust. I never dynoed it with the stock PROM. I am VERY happy with the way the car runs after he set me up with a modified tune.
I will be a returning customer for sure.
I will be a returning customer for sure.
#22
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Re: Is a tune worth it
That said, here is my answer. If I had the truck in my possession I'd tune it, but that's not something I'd want to try to mail order tune. I've not worked with a big block truck yet and don't have a tune worked out that I'm comfortable sending anyone.
I had 1MeanZ set me up with a custom tune for my 91 350tpi car and it put down 224rwhp on a Mustang Dyno. Only mods done to it besides the tune was a Magnaflow catback exhaust. I never dynoed it with the stock PROM. I am VERY happy with the way the car runs after he set me up with a modified tune.
I will be a returning customer for sure.
I will be a returning customer for sure.
#23
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Car: 1991 Camaro Z28
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