I took the car to Second Street Speed on Friday to get some dyno pulls with the new ATI combo. It was supposed to be only a few hours but turned into an all day event due to an unexpected ignition problem. I ended up replacing my stock distributor with a MSD unit in between pulls on the dyno. This cured my ignition problem but by then we had heat soaked the blower which was putting out some very high outlet temps. Thank *** for a Spearco A/W IC which was cooling the charge down to 80-100 degrees.

The new F1R performed fairly well but I'm not sure if it is up to the challenge of flowing enough air for the 406. The max boost we saw was 18 lbs which was spinning it right at it's max impeller speed. This was at 7500 rpm. The curve seemed to peak at 6600 and then level off. We believe this is due to a 90 degree rubber boot at the TB which was expanding from 4" to about 8" from the extreme pressure. I replaced the boot tonight with a steel 90 so I can see if it makes a difference in power. If that doesn't cure the power leveling off I can only conclude that the blower unit is not up to the job of making over 1000 HP. Time and more dyno pulls will tell.

Now to the numbers:

731 RWHP @ 7200 rpm

Wheel speed ranged from 160-165

This is 935 @ the crank with a 22% DT loss (TH400, 9")

While these numbers are nothing to sneeze at, it is still lower then the 800 RWHP I had projected.

I am now anxious to get to the track and see what kind of MPH I can pull in the 1/8 while getting some seat time. I know if it is in the 118-120 range that it will run the number I can be happy with.

I want to thank Don, Jeff and Dirk for all of their help and support. It was a long day and they were feeding ice into the cell like it was their job . I also want to thank Bill and Lon from Second Street for being so patient and not kicking us out early. They were a great help in finding the problems.

 

Tory,

Sounds like a really nice number for the first session on the dyno. I have been following your progress and the new setup has really taken your car to the next level. I hope your car continues to retain the streetability that sets it apart from the crowd. There are a lot of so called "street cars" out there that are really just thinly disguised race-only machines. IMHO your car has always been one of the best examples of a true bad-*** thirdgen street machine. Good luck with the track testing.

 

Awesome numbers tory....hopefully you'll get it ironed out

120 in the 1/8 huh? ya that'd be good

 

It looks like it might be time to go with the D-2r it should be able to keep up.












new motor in the works

600+ horse 377 sbc
Ati D-2R

 

I thought that the F1R's were supposed to be good up to about 1300 HP or so? Any idea's whats up? how much did you predict you would be making.

dont get me wrong, those are great numbers, but I get the feeling that you were predicting more from it (1000 RWHP).

EDIT: What did you go for, for Cam selection? What are you running for Heads?

BW

 

I made some calls today and am getting the feeling that the blower is not to blame. After talking to ASSC about the problem we agree that it sounds like valve float. If the springs do not have enough pressure thay will hang open with too much boost. This would make sense because of the way the boost peaks and the power curve levels off.

I need to do some more digging to confirm this and at least check the seat pressure with a spring tester.

The cam is a custom grind from CC. The heads are AFR 210's fully ported. This thing should be making power well over 7000. The goal is to make 800 RWHP which is 1030 HP at the crank.

If I determine that the F1R is not capable then I may look into trading it for a new F2 model. Not that the D2R is bad unit, but I like the idea of being self contained with a large step up ratio.

 

HINT:

you can see valve float on a dyno graph by looking at the suspicious area and seeing very small spikey peaks/valleys



ALSO

My friend had a problem like yours last year.....changed springs and a few other things to no avail. The problem ended up being some bad wires

Just some things for you to look at before going in for major surgury

 

You are expecting to run close to 165mph in the quarter, ouch...

 

:rockon: