Got a track related question? I'll try to answer.

[Joesurf79]

Originally Posted by GrandSport

I love MSRC, but man, those turns just are just killer on cars for oil starvation, fuel starvation and tire wear.

When I was riding the 1.7 on my bike, one side of the tires looked new while the other side was down to about 25%. Next time I'm out there, I'm rotating tires every session.

edit: 2:26 is an awesome time at MSRC for the 3.1. You're flying!

I was running a 1:55.8x or so at ECR when a freaking PEN got stuck between the gas and firewall! On the last straight. 1:57.8 Luckily, it wasn't my brakes.

Thanks - It was the fastest I've run there! Consistent 2:29-2:30 range, and got in behind a few faster guys and just committed. I just wish it "counted". The AIM solo 2 doesn't have a "what would have been" display haha! Just (what I am sure will be) a speed line dropping off like a rock at the end of the lap - that still ended up being the fastest I've run there (pulling data when I get home - too tired last night after driving from cresson to sugar land)

[CSG Mike]

Originally Posted by Joesurf79

Thanks - It was the fastest I've run there! Consistent 2:29-2:30 range, and got in behind a few faster guys and just committed. I just wish it "counted". The AIM solo 2 doesn't have a "what would have been" display haha! Just (what I am sure will be) a speed line dropping off like a rock at the end of the lap - that still ended up being the fastest I've run there (pulling data when I get home - too tired last night after driving from cresson to sugar land)

If you have the full lap, it think it's fair to say a "could have been" extrapolated via the predictive lap using just a few sectors is a pretty safe bet.

Some people break up a track into a million sectors to get an impossible theoretical time, which, IMO, is just dumb.

[Joesurf79]

Originally Posted by CSG Mike

If you have the full lap, it think it's fair to say a "could have been" extrapolated via the predictive lap using just a few sectors is a pretty safe bet.

Some people break up a track into a million sectors to get an impossible theoretical time, which, IMO, is just dumb.

Yeah, I'll post up a screen shot of the lap I just configured a page on the AiM to be the Predictive Lap time, and ran that all weekend. It's a pretty neat feature!

I wish I could explain how emotionally gut wrenching it was to see a previously thought impossible time on the AIM vanish due to fuel starvation, exiting THE LAST FREAKING CORNER - which happens to be a long 85+mph sweeper...


Having to immediately pit, get out of the car and jump into a student's car - I was a delirious mess for the first few corners...


Just have to get out there next time and do it again!

[ka-titties]

Sorry for my ignorance, as I haven't been inside an 86 fuel tank, but would a HydraMat help the fuel starvation issues? Are they applicable to the 86 chassis/fuel system?

https://www.holley.com/products/fuel_systems/hydramat/

[Jonsey]

2:26 is getting quick. Nice job, Joe!

Originally Posted by Joesurf79

*raises hand* - 5/8ths tank WITH the Velox flapper installed, on RC-1s with aero at MSRC = fuel starvation yesterday. Ruining a PB lap on the 3.1 configuration...


I am hoarse today - I was screaming in my helmet as I watched my AIM predicted lap grow from 2:26XXX to 2:28.15 as it coughed , bucked, surged, and coasted across the start finish. tombstone and then Big bend back to back running CCW guarantees fuel starve at the end of a session if I'm not going out with a full tank

[Joesurf79]

Originally Posted by Jonsey

2:26 is getting quick. Nice job, Joe!

Thanks man! I'm playing hookey on 11/16 to an Apex event on a Friday. The wife only agreed if I agreed to leave as soon as I have a 2:27.3 or faster on aim and video !

I'm hoping for a short expensive trip !

[Joesurf79]

Originally Posted by ka-titties

Sorry for my ignorance, as I haven't been inside an 86 fuel tank, but would a HydraMat help the fuel starvation issues? Are they applicable to the 86 chassis/fuel system?

https://www.holley.com/products/fuel_systems/hydramat/

Hmmm...I'm intrigued. I'll be investigating that stuff - you could for sure get it in the tank no sweat. Where to place and plumb in, that will be what I need to figure out.

[ka-titties]

Originally Posted by Joesurf79

Hmmm...I'm intrigued. I'll be investigating that stuff - you could for sure get it in the tank no sweat. Where to place and plumb in, that will be what I need to figure out.

I did a little research on the fuel system this morning and noticed that the pump sits inside a surge tank. You would use the regular sock coming off the pump. I'd put one of these on the pickup for the sump on both the LH and RH sides of the tank.

[Joesurf79]

Originally Posted by ka-titties

I did a little research on the fuel system this morning and noticed that the pump sits inside a surge tank. You would use the regular sock coming off the pump. I'd put one of these on the pickup for the sump on both the LH and RH sides of the tank.

Looking at it a little at lunch, there is a hydramat that is a cross with the 3/8" female NPT port out on the end of one of the cross arms. Fit a 90 degree 3/8" NPT to 3/8" hose barb fitting into the Hydramat, then run a 3/8" fuel line to the inlet for the factory filter sock. Just have to drill a small hole in the bottom of the fuel pump basket.


Ordering parts is eminent...as long as there is room in the tank for all this to play nice with the other parts. Orienting the cross towards the center of the car pretty much ensures the sloshing fuel will get wicked up by the hydramat...

[CSG Mike]

Originally Posted by ka-titties

Sorry for my ignorance, as I haven't been inside an 86 fuel tank, but would a HydraMat help the fuel starvation issues? Are they applicable to the 86 chassis/fuel system?

https://www.holley.com/products/fuel_systems/hydramat/

Unfortunately almost all the hydramats require a fitting, not a push-on.

I have a hydramat in my car and still get fuel starve under heavy fuel consumption load, but under a sip condition, I can literally run the tank dry. The issue is that the hydramat itself can't buffer enough fuel during a starve condition.

[CSG Mike]

Originally Posted by Joesurf79

Looking at it a little at lunch, there is a hydramat that is a cross with the 3/8" female NPT port out on the end of one of the cross arms. Fit a 90 degree 3/8" NPT to 3/8" hose barb fitting into the Hydramat, then run a 3/8" fuel line to the inlet for the factory filter sock. Just have to drill a small hole in the bottom of the fuel pump basket.


Ordering parts is eminent...as long as there is room in the tank for all this to play nice with the other parts. Orienting the cross towards the center of the car pretty much ensures the sloshing fuel will get wicked up by the hydramat...

Unfortunately not a solution at this time

I have some other ideas that I'll be trying.

[Joesurf79]

Originally Posted by CSG Mike

Unfortunately almost all the hydramats require a fitting, not a push-on.

I have a hydramat in my car and still get fuel starve under heavy fuel consumption load, but under a sip condition, I can literally run the tank dry. The issue is that the hydramat itself can't buffer enough fuel during a starve condition.

Which size / shape hydra mat? How is it oriented in the tank? Obviously the "volume" of the hydramat will affect its ability to buffer dry pump events.

A 3/8" NPT to hose barb fitting is an easy solution. If the hydramat can be made to touch both sides of the tank, AND 3/8" fuel line can reliably be affixed to the pump inlet, AND there is room for the whole shebang in tank - I'm optimistic it would work.

And like all ideas that are good on paper, it has to work, right?

[CSG Mike]

Originally Posted by Joesurf79

Which size / shape hydra mat? How is it oriented in the tank? Obviously the "volume" of the hydramat will affect its ability to buffer dry pump events.

A 3/8" NPT to hose barb fitting is an easy solution. If the hydramat can be made to touch both sides of the tank, AND 3/8" fuel line can reliably be affixed to the pump inlet, AND there is room for the whole shebang in tank - I'm optimistic it would work.

And like all ideas that are good on paper, it has to work, right?

Unfortunately, there are some severe space constraints with our cars... but custom fittings would theoretically allow for a GIANT hydramat.

I haven't had time to do anything like that, yet.

I'm currently on dual 15"x3".

Ultimately, I think a in-tank surge tank solution is going to be the true answer.

[ka-titties]

Originally Posted by CSG Mike

Unfortunately, there are some severe space constraints with our cars... but custom fittings would theoretically allow for a GIANT hydramat.

I haven't had time to do anything like that, yet.

I'm currently on dual 15"x3".

Ultimately, I think a in-tank surge tank solution is going to be the true answer.

Isn't the OEM fuel pump cradle a surge tank, though? Why is it so ineffective? I'm guessing the volume capacity is too low.

What if you made a hole in the bottom of the surge tank (rendering it useless) and ran a Y fitting off the pump with a 3/8 hose going to both sides of the saddle with a HydraMat on each end?