98 12v Upgrades

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APWCU

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Mar 11, 2008
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I ran my 98 12v QCSB auto 2wd this past weekend at Rudy's. It was only the second time I have raced it and am looking at improving power a bit from what I have now.

My setup right now:

Built Goerend trans with billet input and stock stall triple disc converter.
Htt 62/65/13 with dual wastegates over an s475 with the 96 1.32 housing.
Infinite performance 5x16 injectors
Infinite performance 7mm 100cc DV's
4k gsk
Stock 180 pump with Mack rack plug and no plate
Beans sump with Walbro 392 running into factory fuel lines with factory mechanical pump with a heavier spring, runs about 90 psi idle, haven't tested down the track.
Arp 425 head studs, head has never been off
60lb valve springs
Aux trans cooler inline with factory cooler
24* timing
72 lbs boost
Stock Dana 70 4.10 rear-end
Stock cold side boots

My best time this past weekend was a 7.54 at a little under 94 mph. Truck is on 33 x 10.50 M/T slicks and I had a best of 1.72 60'. I have no suspension mods or traction bars yet.

I'm looking at getting the truck down to the 6.7 range, but I'm not sure what to do first to get there. I've been looking at sending the pump off to get benched, but thinking I may need turbo upgrades at that point. I'm also looking at drop in cams for it, but not sure if needed or would be beneficial.

I'll try to get some vids uploaded from ththehis weekend.

Any advise on what my next upgrades should be?

I was trying to dial my afc live to turn it down a little, but ended up breaking out of the 7.7 class on my first pass with a 7.63 and I let out early. I had a blown boot and didn't realize on my 2 qualifying passes and ran a 8.3 both times.

Thanks.

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Id have the pump maxed and benched. Then maybe some more injector and suspension work. How hard were you launching it?
 
Get some more fuel in that thing. Like above, get that pump screaming.

Traction bars. I bet you've got axel wrap. If anything they'll make your 60' better
 
40ray said:
Id have the pump maxed and benched. Then maybe some more injector and suspension work. How hard were you launching it?
Click to expand...
I was launching at around 18-20 lbs, the track hooked very good.

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How much does it weigh/ whats your goal weight? Put the numbers in the calculator, and pick your parts.
 
56cummins said:
How much does it weigh/ whats your goal weight? Put the numbers in the calculator, and pick your parts.
Click to expand...
Truck weighs right at 7k, I removed the rear seat for the race but other than that it's all stock down to the spare tire and even a gooseneck in the bed.

I think my first priority is to remove the pump and send it off to get benched, then I plan on pulling the head and going ahead with oringing. I'm very suprised that the head gasket has held up to at least 70 psi for a year with only studs and 21-24* of timing.

How far can I take this turbo setup? I know if I upgrade I'll probably need to pull my goerend converter and raise the stall a little bit, although right now it seems to be a good setup for what I have.

I don't mind doing some things to cut weight, but my end goal is to keep the truck semi streetable, as I daily drive it right now.

I used to have a 63/68/14 as my top turbo, but changed to the 62/65/13 to utilize the dual wastegates to run the 475 a little harder. With the 63/475 and 21* timing I ran a best of 7.88 at 91 mph and dynoed 642. After swapping to the 62 and advancing the timing to 24*, I ran the 7.54 at 93.9.

How much power is it going to take to get into the 6.7 range with my weight?


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We had problems launching at anything over 18psi. If it were me i would go to a 63/80, some more fuel go on a diet, and work on the suspension.
 
Here are a few pictures and videos from this past weekend.
 

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Assuming your truck is a realistic 6500#, it takes 750 HP to run 94 MPH which calculates to 119 MPH 1/4 mile trap speed.

Assuming you dropped your 60' time down to a realistic repeatable 1.65 seconds, you'll end up trapping 108 MPH in the 1/8 or 140 MPH in the quarter which calculates to 1215 HP. Or in other words, you need to bump your power up another 465 HP!

Basically you need to put your truck on a diet and work on the suspension so you can cut sub 1.6 second 60' times, or you need to add MUCH MUCH more than a simple benched 180 HP pump and an S480. You're also going to end up breaking the stock output shaft in the tranny and probably kill a few billet inputs along the way unless you can get the launch smooth and consistent right away.

Not being pessimistic, just trying to paint the picture of the how big of a performance step it is to go from 7.54 to 6.70 in the 1/8th or going from high 11's to low 10's in the quarter mile with a heavy vehicle. Drop your current power plant into a lightened 2wd single cab 4500# race truck with proper suspension to cut consistent 1.45 60' times and you've got a consistent 6.70 race truck with a moderately reliable turbo/engine/tranny setup! Win Win!

Or keep your street/strip/daily driver setup and plan on 1250 rwhp and everything it takes to make that much power reliable.
 
Here is one of my time slips for anyone interested.


uploadfromtaptalk1460465747116.jpg

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