XR Chassis mods

[Ray]

Wow, that is insane power with stock head. Nice

[merkurdriver]

287HP with stock head, stock cam and stock turbo! Wow, thats really impressive.

[pyropete125]

awesome car for sure!

engine dyno or chassis? mustang or dynojet?

stock ports and valves?

stock or ? bottom end?

287hp seems awfully high for what little has been done. what class are you going for?? GTS?

Your IC is working good! I have a log from 21 psi on a 90* day with a cut down mack truck IC I made:

http://img.villagephotos.com/p/2002-10/ ... 28--04.jpg

Pete

[youngfg]

I dynoed the car on a load bearing Superflow Chassis dyno.
My motor came out of the original XR that I bought for $150.00, I have not had it open, I can only imagine that it's totally stock. It probably has about 200k miles on it.

I will run NASA time trials in it, in Super Unlimited class.

It ran OK at the track. My rear shocks and springs are too stiff, the car is really loose. Other than a few little issues the first time out went great.
My biggest fabrication item left is making a rear wing for the car. I think I am going to make a mold off my fiberglass RS500 wing so I can make a CF one. I will also make a regular airfoil style wing for it.

Here is the MSQ file in the car right now, I am running MS1 Extra, 029Y firmware.
MSQ file

Pic from the track.

[John Brennan]

"We're not worthy! We're not worthy!"

Beautiful car...

[thebronze]

"We're not worthy! We're not worthy!"

Beautiful car...

Maybe Your not....

[John Brennan]

I figure if I were, I'd have it, or something like it... "but I have promises to keep," and so forth. I chose to have a large family, and don't regret the decision... even if it means I must sometimes just watch and cheer others' efforts.

[pyropete125]

what tire/rim size and compounds are you running?

the care is awesome! it does need something badass in the back though for a wing. a large airfoil is probably the ticket.

with more downforce in the rear will that make your current shocks/springs ok?

[youngfg]

For wheels right now I have 17X10.5 front and rear.
I have some old 335/35/17 Kumho V710's on the car now.
They are a little too wide for the 10.5" rim, I will get some new 315's when I ready to run the car some more.

I will probably get some custom 17X12 rims so I can run the 335's

The car is too loose in low speed corners where a wing wouldn't help, and it's crazy loose on the high speed corners.
Generally cars have more trouble with understeer as the slower the corner becomes.
The perfect setup is to have the spring/shocks make the car handle neutral or slightly loose in the low speed corners, then have enough rear downforce to keep the car stable/understeer in the high speed corners.

I will probably run a wing like this car has.

[Loc]

I cryed . Wet my pants. Turned Green with envy and then just sat here in shock as i went through this !!! Gene= Merkur Idol.

[Raze]

Did I read your MSQ file right that you're running 15.8-14.3 AFR Target? Your spark looks normal. If you're running near stoich @ load that's impressive...

[youngfg]

I don't run closed loop, so you can ignore the AFR targets.

[Raze]

Us too, that's why I asked that's a crazy graph, though your remark about the IAT being 99 deg would be a major factor, that's ridiculously cool. It looks like you're running out of fuel up top though as your AFR shoots up the last 500rpm. What fuel pump/injectors/fuel pressure regulator you running? I ask because we're running a stock 180k+ engine with 75#/hr injectors and a high pressure 255lph pump on the stock regulator and have no problem controlling AFR right out to 6500 rpm...

[youngfg]

Yes it's running out of fuel.
I am running a Bosch external pump, stock rails, regulator, and injectors.
I plan on getting some bigger injectors, I just haven't had time to work on the car at all.