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> 914 ls1 turbo build thread, a thread from the start
returf
post Aug 18 2012, 04:10 AM
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When I had the car together before taking it to UCOL Motorsport, I sat in it with my race helmet on and decided we may have to lift the roof to get adequate clearance. Brent and I were tossing some ideas around and one was to explore the possibility of dropping the floor section under the drivers seat. The phone goes the next morning after the car came back from the blasters " I think we should make a new floor section right accross" I'll come and have a look I replied. " No I'm just letting you know we cut the floor out already" semi stunned silence from my end " Oh and you don't have to worry about the diagonal for the rollcage hitting the bulkhead either. Thats not there now as well"
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well I suppose the car is getting lighter!!

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They will be calling me flintstone now
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returf
post Aug 20 2012, 01:01 AM
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Brent, the Tutor looks on admiring his handywork in the previous shot. The new floor is just sitting in place while we ponder making a new strengthening tunnel for the fuel and brake lines to go through. The new floor has allowed the movement of the seat closer to the centreline. This will help in the weight distribution and as one of my other clever mates pointed out. " once he gets his bum in the seat the c.g. will lower more than the 50mm you dropped the floor" cheeky sod!!
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returf
post Aug 20 2012, 02:45 AM
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Another view shows the drop section of the floor. there will be another flat sheet of alloy to go under this as a single piece from the from splitter[attachment=15510
0:P1010024.JPG]
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returf
post Aug 20 2012, 02:49 AM
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I had cut away the rear towers to allow the shocks to clear (remember the trailing arms have been extended ) So a set of strengthening boxes were made up to fill the gap and support the towers.

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returf
post Aug 20 2012, 02:51 AM
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returf
post Aug 21 2012, 05:28 AM
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Engine had to go back in before the cage positions could be finalised. I don't think you could fit any more people in that engine bay!
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you've heard of the Goodwood engine stand I expect??


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I'm pretty sure this isn't a kiwi invention!!!
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returf
post Aug 21 2012, 05:33 AM
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Watch out for sharp edges boys
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Ready for the start of the cage now


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Racer Chris
post Aug 21 2012, 08:34 AM
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Thats going to be quite a rocket ship.
I've autocrossed a 500bhp LS6 powered 914, and I stood next to it while it was going 180mph on a dynojet.

I am definitely enjoying watching your progress!
Thanks for sharing.
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returf
post Aug 21 2012, 03:05 PM
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QUOTE (Racer Chris @ Aug 22 2012, 02:34 AM) *
Thats going to be quite a rocket ship.
I've autocrossed a 500bhp LS6 powered 914, and I stood next to it while it was going 180mph on a dynojet.

I am definitely enjoying watching your progress!
Thanks for sharing.
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Thanks Chris . While you're there and given your experience with racing 914',s do you have any starting point suggestions for the anti rollbar sizes?
Mike
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Racer Chris
post Aug 21 2012, 08:49 PM
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My 1.8L race car has a 32mm (1 1/4") hollow front bar.
I would think that's also appropriate for a car like yours.
If you have a limited slip differential a small rear bar is also a good idea.
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returf
post Aug 21 2012, 09:27 PM
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QUOTE (Racer Chris @ Aug 22 2012, 02:49 PM) *
My 1.8L race car has a 32mm (1 1/4") hollow front bar.
I would think that's also appropriate for a car like yours.
If you have a limited slip differential a small rear bar is also a good idea.

Thanks Chris, that's a big help as I probably wouldn't have guessed at that big for the front.
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returf
post Aug 22 2012, 01:26 AM
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things are moving along well over at the UCOL workshop so I thought I should contribute a little. My task was to exchange the rather original looking rubber trailing arm bushes for some nolathane ones
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returf
post Aug 22 2012, 02:18 AM
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You can see by the last photo how much the weltmiester strengthening plates have shrunk!! My school teachers had the same problem with my socks too! funny that! Hopefully the nolathane will do the job. I see on some of the 914 sites there are some quite fancy poly bronze bushes available in the USA but alas, mention 914 down here and you get some funny looks .
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returf
post Aug 22 2012, 02:29 AM
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the boys have bee getting on with things as well, making the new internal crossmember for in front of the new floor
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and repairs to the old battery box area


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Racer Chris
post Aug 22 2012, 10:58 AM
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QUOTE (returf @ Aug 22 2012, 02:18 AM) *
I see on some of the 914 sites there are some quite fancy poly bronze bushes available in the USA but alas, mention 914 down here and you get some funny looks .

Shipping to NZ via the USPS isn't too bad.
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Racer Chris
post Aug 22 2012, 10:59 AM
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QUOTE (returf @ Aug 21 2012, 09:27 PM) *
QUOTE
My 1.8L race car has a 32mm (1 1/4") hollow front bar.
I would think that's also appropriate for a car like yours.
If you have a limited slip differential a small rear bar is also a good idea.

Thanks Chris, that's a big help as I probably wouldn't have guessed at that big for the front.

What tires and what springs/shocks are you planning to install?
Will the car see much track time? or is it just for the street?
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returf
post Aug 22 2012, 02:53 PM
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Definitely only a track car now, I'm going to run full slicks, 285 wide on rear and 255 front on 18" rims x 10.5 and 9.5. The springs I have at the moment are 336lbs and 448lbs The mechanical leverage point at the rear is altered with lengthening of the rear attaching point of the shock on the swing arm (shock lays over a bit more ) and the front bottom arms are also longer. Coupled with these alterations, we are hoping to generate a large amount of downforce with the aero so it will probably be a bit of realtime R&D to get the right spring rates. My son tells me if we can't stop roll to a large degree we will wipe the skirts diffuser and splitter off the car.
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Racer Chris
post Aug 22 2012, 05:17 PM
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I thought it was full track prep with the undertray and such.
As far as I know I have the only front sway bar kit stiff enough for your application.
My car rolls approximately 3 degrees at the limit on Hoosier bias ply cantilever slicks.
But its lighter and has a little lower CG than your car will.
However, I can't stiffen the front bar any more until I re-install the rear bar.
It already lifts the front inside tire under some circumstances.

The motion ratio doesn't change all that much with the longer arms, but if I'm not mistaken, the front effective spring rate goes up and the rear goes down.
You'll need to keep the rear spring rate a little soft to maximize grip for acceleration, so the car doesn't turn around on you. I would be tempted to use the same springs front and rear at first.
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returf
post Aug 23 2012, 04:22 AM
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Not too much happened today I can take photos of, but reports of a new roof being rolled up are making me keen for another photo op. Will post as soon as possible
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returf
post Aug 26 2012, 08:29 PM
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Well I've been a bit loath to add this next post as I have to admit to a fail. I went to see how the roof was getting on a couple of days ago and the UCOL boys had been busy. The roof that was folded up incorporated a raised center section that had the makings of a real neat looking and functional air scoop for the intercooler intake. I gave Brent a hand to tweak it a little and stood back, squinted just a little to imagine it finished and opened a beer.
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The next thing on the discussion agenda was the venting arrangement of the radiator. "not too big, not too small, just right" were my instructions. I get home and am explaining to my son how good this is going to function when reality smacks me in the chops. What was I thinking!!, moving all that hot air from the radiator, catching at least a third of it and channeling it to my intercooler.
I phoned a very clever friend of mine that happens to be a design engineer and has worked in the aircraft industry. "Thank goodness you stopped" i think was the quote. He kindly explained to me how to use the hot energy from the radiator as a helper in our aero package and as polite as I've ever heard anyone tell me, how we had created unwanted drag and unwanted heat transfer to the project. Yes, double jeopardy ( or in my words Stuffed up")
At least the crossover headers will have a neighbour on the "wall of waste"
I finally broke the bad news to a fairly and justifiably unhappy camper last night with long gaps in the conversation. I'm sure he'll come around ( i wonder what that brown box at my door is, it seems to be ticking)
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