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Cars > Andy94SC’s Garage > Blog

 

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Andy94SC

M
Linden, Michigan
United States

 
 

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Almost two years later...

By Andy94SC

Filed under: /blogs/browse/t/vehicle/v//p

Wow I can't beleive it has been this long since I updated the information here.

In a nutshell here is what brings you up to speed;

Last summer I added Kooks long tube headers, a Lingefelter fuel pump upgrade, and Patriot Gold dual valve springs in an attempt to pick up some more power.

I had the car retuned and found I picked up a whopping 10 HP at the peak.

The car does sound better with the headers, and seems to have more power across the whole RPM range, but I must say I was expecting more power.

So in the fall of 2008 after the GTO had been put away for the winter another round of upgrades began.

First of all was a flowtech positive displacement grind blower cam, and matching pushrods. To get the cam degreed just right I used a Comp Cams double roller timing set.

That was suppose to be the end of that job, but trouble came. The double roller requires spacing the stock oil pump out from the block. I think that contributed to the loss of oil pressure shortly after start up with the new cam.

Rather than fooling around if I had to take it back apart, I went with the SLP high volume pump that works with the double roller without needing spacers or other modifications.

Reassembly after that upgrade led to the next problem. I used the "longer bolt" method to try and pull tha balancer on (It has worked for me a few times in the past) unfortunately doing so led to trashed threads in the crank, and ultimately to a broken bolt in the snout of the crank.

Luckily I was able to simply tap threads into the out portion of the crank and use a larger 3/4" bolt in place of the stock one.

So the People Eater is up and running again. The new cam sounds angry! I can't wait for Spring and another dyno tune to see what power level we are at now. If it isn't a significant gain I'm afraid I might just have to build a stroker block and throw a bunch more boost at it...

Hopefully it won't be two years until I give you the next update.

The GTO goal for 2007

By Andy94SC

Filed under: /blogs/browse/t/vehicle/v//p

My intent with this car from the beginning has been this; I want it to be quicker in the 1/4 mile than the current Corvette Z06 (I am shooting for 11.7 or better Sec) WITHOUT ANY loss in driveabilty, handling, or fuel economy. I want NO compromises.

I think I am well underway. I beleive the car has the power to run low 12's right now based on what I have seen other GTO's run with this power level and trap speed. My 12.6 runs were with tire spin through 1st gear, and very high intake air temps. (~165 Deg F, normal for the car is around 110 - 120)

Thanks to the Vector tune there is no perceptable change in driveability, and amazingly, day to day fuel economy has gone UP by about 20%. Stock I used to get about 21 MPG, now it is easy to get 25 - 26 MPG.

If there is enough cash left in the budget from the body work (spoiler and rear bumper change) I am going to try to get some long tube headers on it. I would also like to get some valve springs in it. The tune currently has the rev limiter set a few hundred RPM low due to the weak stock springs. If I didn't have to worry about valve float, we could go up another few hundred RPM. Look at my dyno chart - HP was still climbing at the rev limiter, a few hundred more RPM will let that HP climb farther.

If that doesn't get me where I want to be I guess there are still the options of more boost, heads, cams, etc. The car is still mostly stock, there is plenty of room to grow.

I don't think I want more power beyond that. I don't want to get to the point of needing major fuel system upgrades, or expensive driveline upgrades. Also the car is tire limited. My Nitto drag radials are rubbing - I can't get any more tire on there, and these are already difficult to hook up.

Plans beyond that goal? I guess I will work on the appearance. I'd like new wheels, I have never liked the style of wheels the GTO got. I'd also like the HSV body parts.

Stay tuned.
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