Z_WAAAAAZ

BRB, gonna watch the OG Fast and Furious to try and regain a bit of culture.

Stock

Throw in some Option and Best Motoring for good measure!

Kboi12

My reason for not jumping straight to a 6spd the poor gearing. I am not a fan of the 5 speed gearing myself. Id prefer much longer distances between gears especially in a turbo charged motor. While a 3.9 or 3.6 diff could help it stills brings the gears to close IMO. 5 spd paired with a 3.9 is the my most favorite preference. I will look into upgrading the trans when I put more power ~300whp.

Since the transmission is gone I was exploring the idea of pulling both the motor and trans together and putting forged internals along with a 6 speed and diff. However, I thought of doing a leak down test to determine if it is worth tearing down the motor. Cold Results: 8%/15%/7%/9%. Cylinder two was maintained 15% for ~6hours and is leaking through the exhaust valve. This motor has ~40hrs, 12hrs w/boost, experienced 2 money shifts(8900rpms) and burns 0 oil.

Kboi12

I bit my own words and acquired a 6-speed. I am quite fascinated by how my acceleration and lap times will be affected with shorter gearing. I will give the 4.1 differential a chance, and if not happy, then a 3.9.

Gee Emm

I ran 6-speed/4.1 for years in the original GreenMachine (NB8A), a product of replacing a busted 5-speed with a 6-speed. Acceleration was noticeably improved, at some cost to higher revs on fwy cruising.

On the track that manifested in higher revs - the issue then becoming are you losing more time feathering the throttle in 6th, than you gain in acceleration. For an atmo car, the answer usually is 'no' for a 4.1, but if you have a high power turbo, the redline in 6th is more likely to be a reality, and possibly a liability. The decider would be exactly how much power you have, and the sort of tracks you use.

Z_WAAAAAZ

In for thoughts regarding 6 speed/4.1 on your current setup. I have to say with the 6sp/4.3, I'm doing a lot of shifting between 4/5/6 on our local tracks. It's also become a limiting factor because with the top speed of ~130mph, there's no reason for me to run Willow Springs at my current power level, as the car would be redlined in 6th for a good portion of each lap. Sounds like this can become an issue with some of the super high speed midwest and east coast tracks as well.

A good number of our tracks around here (Chuckwalla and SOW especially) have fairly consistent speeds (3rd/4th or 4th/5th gear) for the majority of the track, with maybe 2-3 substantial braking zones where you're shifting down 2-3 gears at a time. I anticipate eliminating 2-4 shifts per lap with the 6 speed/3.6 combo I just installed.

Kboi12

Finally, I had the opportunity to start tearing down the car. I noticed that all the manifold-to-turbo hardware had backed out, leaving the turbo loose enough to wiggle. I never noticed any power loss. I even set a PB last track day. Additionally, the pilot bearing fell out with the clutch despite it being properly pressed in. I will be getting new bearing as well as stage 8 fasteners.

Z_WAAAAAZ

Those are all exciting finds haha. Stage 8 hardware is definitely a must. worth getting it for your turbo elbow as well. Some of those nuts are near impossible to get to and it's nice knowing you won't have to get in and retighten them periodically.

NoItDoesntHavePopups

Doing some ducting myself for the big spacing between intercooler and rad. Did your ducting work well in the end or you had to redo it?

Midtenn

iTrader: (15)

Skip the Stage8 and go with cross drilled titanium nuts and safety wire them.

M8 Titanium Nuts | Racefasteners New

Z_WAAAAAZ

Oh dang, those are cool. Curious as to why I haven’t seen any talk about this type of hardware for our applications before. I’ll give them a go next time I need new hardware.

Only1Balto

Hello! What a great build- thanks for the photos!!! Super clean.

Looking on the Kraken site- I see they had an intercooler/piping kit for the low mount, but not for the top. Did you just make your own?

I currently have the FM S1 kit- but I'm wanting a 3" exhaust bad. Without there being too many pre-fab'd kits available... I'm really thinking about getting the Kraken top mount manifold along w/ their 3" exhaust kit. Do you think that's a ridiculous idea? The sane part of me says yes :(

Kboi12

I got the none ac piping for the intercooler. If you have the stage 1 kit you can easily figure out a way to utilize the intercooler pipping you currently have with the kit. Decide what your goals are with car and see if its worth it.

shirtz

just found this thread and have also got some kraken gear to put on - thanks for the heads up with the issues you had - will help me heaps.

shirtz

are these significantly better? price is very similar (ie expensive!)

Midtenn

iTrader: (15)

Buy once, cry once. I only have ~4hrs of track time on my car since installing them with no issues. However, half of that ~4hrs is with a turbo support brace and downpipe support brace installed. The benefit of the Ti cross drilled nuts is that you can secure all 4 nuts on a EFR turbo. On an EFR, you can only secure 3 of the 4 nuts with the Stage 8 tabs.

shirtz

ahh ok i have a garret. will cross that bridge when the time is right, seems to be a mainly a UK product which is expensive here in AUS

Midtenn

iTrader: (15)

I did order them from the UK. I looked for a US source, but came up with nothing. I will note, for an EFR I had to take a little off the flange OD to fit in the milled pockets of the turbo flange.

Kboi12

Turbo to exhaust flange gasket broke and the flange is warped. Have to get it milled.

Z_WAAAAAZ

Perceived cause? Wonder if the nuts backed out enough times to allow that.