porscheflat6

https://www.bbiautosport.com/718-gt4

All these suspension parts + swift springs update + DSC Module

porscheflat6

315/30 won't fit according the my alignment guy who measure current clearance with 295/35 and then adding the width difference. 305 will clear my exhaust system but definitely no way to get a 315 in rear. To be honest 265/305 is better grip my .2 GT3 since we are mid-engine. Just need better suspension to keep with the velocity in the corners from high speeds with this much tire on the ground.

sobiloff

Yep, inside.

phefner

Finally broke the 2:40 at this weekends Northwoods Shelby Club event, new personal best is 2:38.36. What a weather PITA. Hot and Dry everywhere else in the US but here in Great Lakes area of the MidWest.

Noticed the Dunlop Sport Race Maxx 2 really drop off after getting up to temp. I'm targeting 33F/36R psi and usually getting there by lap 2. Generally my quickest times are within the first 4 laps. Alignment is Camber F -1.65/0.3mm per toe-in; Camber R: -1.5/1.0mm toe-in per.

superfast02911

You and me both. I get frustrated on the track bc I know I'm leaving so much on the table. Any epiphanies you've come across recently you'd like to share?

porscheflat6

LOL will do - still learning the trust limits of the car but there is definitely a lot more corner speed left and can now comfortably trail brake a little for later braking.

porscheflat6

Nicely done

A few weeks ago I ran at 31/33 hot and they were pretty good for about 5 hard laps before getting slippery.

phefner

Thanks @porscheflat6 , I’ll target that for my next outing over Labor Day weekend with the PCA.

clib

very nice. Its a lot to that track. I also have the old 911 driving style. Have been working on not over braking and trying to carry more corner speed.
are you have with your alignment settings?

phefner

@clib I’m heading to the dealer to replace a corded drivers side rear and fluid service (oil/brake) later this week. Ordered some shims from CMS, so going to add about 6mm in shims to get me closer to -2.0 Camber front and rear; then set the front toe-in closer to 0, and rear toe to 2.0mm tow-in per.

I think that will about do it. Moving forward I want to focus on consistency, and less with the ultimate time.

porscheflat6

might want to consider the swift springs and DSC module as well. Significant suspension performance improvement.

phefner

Great suggestions @porscheflat6 . First for next year is a set of dedicated 19” APEX wheels for the track. Then I like your idea. Going to budget for both.

I clocked 10,000 miles this weekend as I arrived at Road America. 9,000 of those miles over the last 10 months have been B-roads, leaving a 1,000 miles on the track. So clearly a 90/10 ratio.

I’ve not seen anyone bust 2:30 at Road America in a GT4 without significant track mods. At 2:38, I know there are a few seconds in technique alone, and I want to find those before spending too much more on mods.

I really love this car.

porscheflat6

Awesome! Way to rack up the miles! Yep just got my APEX and very pleased. I have been using Forgeline for 8 years and they one of the best but so far for the money I don't think we can beat Apex value and quality. All honesty, Suspension, brakes and tires the car can really compete with GT3's. I am quite pleased coming from a 3RS to GT4 how much fun I am having trying to get my GT4 between stock GT3 on Hoosier and my 3RS which was just a monster of a track car.

superfast02911

My feelings exactly. I'm too ginger with this thing in the corners.

porscheflat6

Me too and I drive it like a 911 but that is all I know for the past 8 years. The car is incredibly fast in the corners and just need to develop a bit more trust which for me is just some seat time.