The never before 98GT blower setup

[navyellis]

hey there guys! so here is the deal, I have a 98GT and I have completed the PI head swap with patriot performance stage II heads, comp cams with the typhoon II intake manifold, K&N cai 75mm throttle body and so on...down below I have an off road x pipe and flowmaster super 40 series, baer 14' rotors with the 6 piston calipers (baer pro +) a Tremic t-56 6 speed, McCleod rst twin disc clutch. the the project on hand is a whipple supercharger on top of the intercooled tork tech intake manifold. my car is currently making 307 RWHP and 312 lb-ft torque. now here is the kicker...the blower we are putting on is a 3.4l. Yes my bottom end is built for it, but what I'm looking for is input on what to expect and general input on the build. anything is helpful. I had to get a custom made crank pulley made because with the standard pulley and a 4" blower we would be making about 18-20 lbs of boost. We are making a custom 6" pulley to get somewhere between 12 and 14 lbs... I'm excited for the project to come to life but I know that I need wisdom from the more experienced people that drive with boost, cautions, and things to expect!

 

[sdsubzero4]

I didn't know Whipple makes a blower for a 2 valve. I thought they only make it for a 3 and 4 valve.

 

[navyellis]

lol, thats true. the torktech intake manifold takes the 99-04 GT manifold and cuts the top of it off and makes it the same as the 03-04 cobra. and it essentially becomes a cobra top end. check it out www.torktech.com

 

[northerncountry]

I am running a whipple 2.9 right now running 10-11 lbs on my stock bottom end I am making 470 to the tire. anywho what is the compression your running right now? if your running 8.5:1 I would say you would be in the 500-520 rwp ball park.

 

[Ford1288]

Looks like you are going to have a monster on your hands. That is a huge blower. Depending on the tune 475+ rwhp is probably the near outcome. Is your rearend ready also?Thumbs up to you for doing something different.

 

[yosemiddysam]

My best advice is dont use the go pedal too much in the rain!!!!!

 

[navyellis]

lol, thanks guys! if you have any interest, the car is currently over at CCC motorsports with Greg Rentis doing the install! It should take a couple weeks or so to complete. I can't wait to see what the outcome is! compression is 8.5:1 and I'm not sure what you mean by the rearend... It currently has 3.73's but if your asking about the axles, no I have not upgraded to the 31 spline yet... what is the value/ reason to do that?

 

[Ford1288]

Upgraded differential, axles, etc. That's gonna be a lot of torque to put through a stock rearend.


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[Mustangcwo]

lol, thanks guys! if you have any interest, the car is currently over at CCC motorsports with Greg Rentis doing the install! It should take a couple weeks or so to complete. I can't wait to see what the outcome is! compression is 8.5:1 and I'm not sure what you mean by the rearend... It currently has 3.73's but if your asking about the axles, no I have not upgraded to the 31 spline yet... what is the value/ reason to do that?

Your stock axles are rated at 4165 ft/lbs of torque. If you run your numbers as follows, you'll know if they are strong enough: RWTQ X 3.73 X 1st gear ratio X .90 = axle torque

Example 500Torgue X 3.73 X 2.66 X .90 = 4464.81 (BROKEN AXLE)


Additionally, your 8.8 Differential is another weak point. When you upgrade your axles, upgrade the differential...the spider geears will not hold up!!!

 

[navyellis]

ahh! good info, thank you sir!

 

[navyellis]

So the good news is it looks like our final numbers are in on this beast of a project... We have one last problem, my aftermarket 2000 cobra R hood....isn't tall enough. We ended up with 569RWHP and 602 Lb-ft of torque. I agree with MustangCWO, but also dislike lol. Because after calculations using your information (pending accuracy on the Tq rating) my numbers are in fact in the red... The transmission is a tremec
T-56 with the 2.66 first gear ratio. I guess we'll see how long the rear end holds up... fingers crossed!!!

 

[Mustangcwo]

Congrats on the numbers and good luck with the axles. You never know when they will break; but if you never put slicks on the car, you should be OK.

 

[Renegade]

Shattered an 8.8 with 300 wheel on a good hook, upgrade the entire rear end.

 

[navyellis]

well boys, I got her back a few weeks ago! She's vicious! Did a few little upgrades here and there since I got her back, headlights and fogs, rear seat delete, did the "fog light mod" as in having the fog lights on without the headlights. and last but not least I did the axle and diff swap. Here are a couple pictures of the beauty completed! Hope you enjoy as much as I do!

 

[wickedstangs]

@navyellis Nice pics thanks for posting...

 

[navyellis]

Oh...and update on the final power numbers, after a few adjustments and calculations we ended up with 575 RWHP and 675 lb-ft of torque! She's fast...but is it bad that I was expecting it to be faster?!

 

[wickedstangs]

dang your torque is massive.. Nice job..