Test N Tune
Thread Starter
Pro
Joined: Oct 2004
Posts: 644
Likes: 15
From: Clarksville Tennessee
Test N Tune
I went to the track today for test in tune to see how well or poor my car would do with the current tune. The local track is an 1/8 mile and the track prep wasn't all the great. I was using Nitto drag radials for the first time. I usually use BFG Gforce Drag radials and as soon as I burn off the nittos I'm going back to BFG's. I made 4 passes and the best pass of the evening was
60ft.....1.7686
330ft....5.1239
594ft....7.4206
1/8 mi...7.9377
1/8 MPH... 87.01
On this pass I lowered my tire pressure down to 16psi and my launched off the line spinng through 1st gear. My car was running very rich( lot of black smoke from the exhaust). So I hope to get a updated tune after I get a few dyno runs to get an accurate air fuel ratio to work from.
60ft.....1.7686
330ft....5.1239
594ft....7.4206
1/8 mi...7.9377
1/8 MPH... 87.01
On this pass I lowered my tire pressure down to 16psi and my launched off the line spinng through 1st gear. My car was running very rich( lot of black smoke from the exhaust). So I hope to get a updated tune after I get a few dyno runs to get an accurate air fuel ratio to work from.
Thread Starter
Pro
Joined: Oct 2004
Posts: 644
Likes: 15
From: Clarksville Tennessee
1985 L98 383, Scat forged crank and pistons, 10:5 CR, 6" H beam rods, Dart 180cc Pro 1 Alum. Heads, Comp Cam XR 288HR (12-433-8), roller valve train, 1.6 int/ 1.5 exh, Mini Ram, 58mm TB, 30lb injectors, adj fuel reg, MSD6AL, LT headers, 3” front Y pipe, Hi Flo Cat, TCI kit, 3000 stall, and 373 gears.
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
a 383 build Miniram 3:73 With radial drags. Ouch. Get them to re-tune. send a data log. Your way to rich.
your hooking up great 1.7 60ft
My stock 94 LT1 street tires. LS coil conversion, CAI, & my tune. That's it. I also just found out my CATS were clogged from ceramic breakage. After installing my headers & Hpipe 4 days ago.
with a poor 2.1- 60ft
5.8- 330ft
8.8- 660ft
83.44 - 1/8
105.81 1/4 @ 13.477
Last edited by THE 383 admiral; Oct 8, 2015 at 01:43 PM.
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Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
I'll be honest with you...:1/8 mile runs are not enough to dial in a tune....I don't think I am getting out of third gear in the 1/8 mile. Data logging is fine though I agree with that....you want to see a trap speed in the quarter. With that miniram, you are making power in the big end of that track I am sure. Even if it's a little rich you can make a little more by leaning it out but even then you want to know how rich it is....dyno tune can help with that although no one touches these dinosaur ECM's anymore. But again these 1/8 mile runs are not enough to test a miniram car...little more than stop light to stop light.
I would bet with those 60 foots.....pretty damn good BTW, your car is well within 12's with the existing tune.
I would bet with those 60 foots.....pretty damn good BTW, your car is well within 12's with the existing tune.
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
Thread Starter
Pro
Joined: Oct 2004
Posts: 644
Likes: 15
From: Clarksville Tennessee
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
Thread Starter
Pro
Joined: Oct 2004
Posts: 644
Likes: 15
From: Clarksville Tennessee
I'll be honest with you...:1/8 mile runs are not enough to dial in a tune....I don't think I am getting out of third gear in the 1/8 mile. Data logging is fine though I agree with that....you want to see a trap speed in the quarter. With that miniram, you are making power in the big end of that track I am sure. Even if it's a little rich you can make a little more by leaning it out but even then you want to know how rich it is....dyno tune can help with that although no one touches these dinosaur ECM's anymore. But again these 1/8 mile runs are not enough to test a miniram car...little more than stop light to stop light.
I would bet with those 60 foots.....pretty damn good BTW, your car is well within 12's with the existing tune.
I would bet with those 60 foots.....pretty damn good BTW, your car is well within 12's with the existing tune.
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
1985 L98 383, Scat forged crank and pistons, 10:5 CR, 6" H beam rods, Dart 180cc Pro 1 Alum. Heads, Comp Cam XR 288HR (12-433-8), roller valve train, 1.6 int/ 1.5 exh, Mini Ram, 58mm TB, 30lb injectors, adj fuel reg, MSD6AL, LT headers, 3” front Y pipe, Hi Flo Cat, TCI kit, 3000 stall, and 373 gears.
are you running the '870 computer with a Fastchip ?
Thread Starter
Pro
Joined: Oct 2004
Posts: 644
Likes: 15
From: Clarksville Tennessee
I'm running a 870 with a Fastchip. He's the only person I know of that still tunes chip for the 870
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
TPIS in Chaska Minnesota will do it on a wheel hub dyno...but you have to get the car to them. Having said that they will also do chips for the 870...not cheap but they are good!
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Sorry i dont understand 1/8 mile times as i only race 1/4 mile (and in my camaro). But i have a traction problem even running MT DR @ 18psi and cant get my 60' times under 2.1sec. So i need to get it to hook and that means a better torque arm and change my weight balance if possible. I dont run drag shocks and my camaro sits pointing down in the front - making it light in the rear on launch. Plan to fix those items to stop some wheel spin. Dang tires spin even if i baby the throttle on launch. I dont kow what the corvette guys use for a torque arm but u need something to keep the axle(s) from wrapping upward on a launch. I think when u get to a high pwr level the corvette axles tend to move the tires outward at the top (pos camber) and lose some traction as the rear end tries to "stand up". So the cure sometimes is a straight axle.
IMHO u may have something to gain in a tune but u need to hook to use it. Still will be a fast car, just will spin like on ice from a stop.
IMHO u may have something to gain in a tune but u need to hook to use it. Still will be a fast car, just will spin like on ice from a stop.
Drifting
Joined: Oct 2005
Posts: 1,918
Likes: 51
From: Angier nc
Play around with the air pressure and do a good (but not excessive) burnout.I used to run my DR around 20psi.
When you have a high torque car the stiff sidewall DR can be harder to handle the shock load to the tires.Add some low gears and a high stall and you hit the tires hard.A stock suspension won't handle well either.
A bias slick can absorb the shock load better and bite more.There is a limit for drag radials and stock suspensions for hooking.
When you have a high torque car the stiff sidewall DR can be harder to handle the shock load to the tires.Add some low gears and a high stall and you hit the tires hard.A stock suspension won't handle well either.
A bias slick can absorb the shock load better and bite more.There is a limit for drag radials and stock suspensions for hooking.
Thread Starter
Pro
Joined: Oct 2004
Posts: 644
Likes: 15
From: Clarksville Tennessee
On the street with street tires mounted my car will break traction that's to be expected given the mods I have. But on the track I know my car will hook it's just a matter of finding the right tire pressure that hooks. I've never used Nitto DR before so I was figuring out what psi will hook. My last set of drag radials were BFG's and at 26psi with a short burn out in the box my car would hook every time. during that time I ran a slightly small cam and a different tune and my best 60ft was 1.686 7.836 1/8 mile..