as promised: track results for L98 crank pulley

[tpivette89]

last month i baselined my current combo several times at our local track. best timeslip read:

13.16 at 103.79 w 1.76 60ft

since then i had some problems with my car that resulted in the replacing of the MAF sensor. that set me back about a month. so after i fixed the car, i installed the crank pulley and went back down to the strip today. weather conditions were nearly identical. only one major thing differed between my 13.16 run and todays passes... i ran on street tires this time, when last month i was on DRs. dont ask, its a long story.

anyway, even with limited traction i was still managing to 60ft halfway decent. so while my E/Ts werent availible for comparison, my mph (the TRUE indicator of a power increase) was. i only got 2 runs in this morning:

13.94 at 104.37 w 2.29 60ft

and

13.22 at 104.73 w 1.86 60ft

so, as you can see with the solid increase in mph, i gained about 10hp from the crank pulley. if i had my DRs on at the time, and 60 footing where i normally do, i believe i could have pulled off a 12 sec pass at 105mph. oh well, theres always next week.

bottom line though... the crank pulley is a legit mod

 

[tntcorvette]

I have a stock crank pully and have considered getting the smaller one for performance reasons.

Did you just do the crank pully or the crank & alternator pully? Also how do your volts look at night with the lights, stereo and the a/c on? I know its not summer but I would like to know how the volts look from this modification.

I could use an extra 10 hp at the crank!

*EDIT* Where did you get the crank pully from?

 

[tntcorvette]

did you throw away the bad maf sensor? If not, i'de like to buy it from you.

 

[tpivette89]

i dont know what brand of pulley this is... i bought it used. i think all of them are about the same anyway... most are about 22% underdrive.

im only using a crank pulley, no alt or water pump pulleys. charging is not really an issue... the volts get a bit low during idle, but as soon as you get moving everythings fine. the lowest ive seen on the digital display is 12.4 volts.

actually, yes i still do have the bad MAF. if youre interested, send me a PM

 

[vettered91]

Did you just do the crank pully or the crank & alternator pully? Also how do your volts look at night with the lights, stereo and the a/c on? I know its not summer but I would like to know how the volts look from this modification.

I have the crank & alternator set in my LT1 (Mr Gasket) and no problem at idle with everything on including a LOT of sound equipment. You should give it a try!

tpivette89,

Thanks for the info, I wanted to know about your test since the other thread because I did the pulleys change at the same time I did the long headers and MSD ignition system. I'm really curious about your new times with the DRs!

See ya!

George

 

[Gerry]

crank pulley times

Hey, TPI vette what other mods do you have on the L98? I just got an 88 and have it running good and would like to start kicking it a little at a time. Did the under drive crank pulley have any deleterious effects on the temp. I know its winter here in NJ but it will get warm here again (I hope). I have been checking out all the mods that mad mic has and they look good. Thanks for any help and info you can provide.

Best regards,
Gerry

 

[tntcorvette]

thanks for the info. I got one priced out of summit by ASP and it is $52 so I went ahead and ordered one. I dont think i'll have a voltage issue since my car idles higher than stock at 800rpms.

 

[Mad-Mic]

i think i'm gonna have to do this myself anything to crack a 12 second pass

BTW Tony i am running mid to high 103 mph runs now and even cracked off 104.65 mph pass. i just gotta get it all right in one shot! but i think the longtube headers, afpr, and a fresh set of cutback delco's will put me in the 12's. i just wanna run a 12.7-12.8 then it's time for the cam/heads/intake goodies

DOOOOO YOU SMELLLLLLLL WHAT THE MAD MAN IS COOKEN? pfsssh pfssssh

 

[tpivette89]

heres the complete list of my mods

FREE MODS:
- cut filter lid
- throttle body bypass
- removed "frisbee"
- ported plenum w siamesed runner openings
- gutted cat
- timing set at 9* BTDC
- cut back spark pugs
- mufflers eliminated

BOUGHT MODS:
- K&N drop in filter
- Hypertech airfoil
- Holley AFPR
- 160* stat
- Exotic Muscle 2.5" front yipe
- Borla 2.5" rear ypipe
- S10 stall converter
- BFGoodrich drag radials
- underdrive crank pulley

 

[Mad-Mic]

Tony clean out your PM box