Twin Seq. Dry sumping for beginners :D

[maxfield]

Did I read that you wanted the ratios from the TDS box?

[Turbo-Brown]

If you've got them that'd be great mate!

[maxfield]

I've got:

1st - 5.125:1
2nd - 2.875:1
3rd - 1.75:1
4th - 1.25:1
5th - 1:1

And the diff is 2.63, I think.

They're not 100% accurate mind.

[march109]

Is that because you worked them out?

[maxfield]

I did them and my tutor confirmed they were correct...

[Turbo-Brown]

F*ck me that's a jump from 1st to 2nd!

Will have to dig out the Sport 'box ratios for a comparison.

Many thanks dude, that's very helpful

[march109]

Hang on alex I have them to hand!

325/325sport gearbox ratios, 320 box is alledgedly the same ratio as 325sport too

Gear , Std Ratio , Sport Ratio
1st , 3.83 , 3.35
2nd , 2.20 , 2.03
3rd , 1.40 , 1.36
4th , 1.00 , 1.00
5th , 1.81 , 0.81

[Turbo-Brown]

Cheers Gareth, time for a spread sheet to see what kind of diff ratio I need

Did ya get my PM a couple of days ago about our order?

[Karan]

i think they are brittle to keep them light... they sure have a lot of air bubble type thingies in them

[march109]

Yeah got the PM, been away for a few days so on catch up mode now.

how much lighter is your flywheel compared to stock.

[Jhonno]

Nice flywheel

[Turbo-Brown]

Air bubbles That really does point to low quality castings! Oh well, they do the job I guess!

Not sure about how much lighter than standard it is as they haven't sent the old one back yet


Bit of progress on the charge cooler today, have made the inner sheet which the trumpets weld onto:







Not sure whether I ordered the wrong size sheet or if it was just supplied wrong, but too small it was hence the extra bit on the right

That took bloomin ages to make so I was gonna to the outer sheet another time when I'd had a think about how to put a nice radius in it.

Turned out the answer was the prop-shaft from the GT6, a length of angle iron, two G-clamps and a Work-Mate, so here's the result:






So when it's all welded together, it should have pretty much this cross-section:





At it's narrowest point it's about 30mm between the sheets so the total free area is around 15900mm^2 Reckon that'll do nicely

[oakey]

Schweeeeeet

[mick_318is]

Wouldn't it be better to put a curve in the upper surface of the charge cooler as well, apart from keeping the cross section more constant along its length it would also make the radius into the trumpets greater.???
Which is where you seem to have a slight restriction.
It shouldn't foul on anything that I can see.

[appletree]

^^^^^^^^^^^^^^^^^


A power bulge!!

[Turbo-Brown]

Will look into putting an extra curve or bend into the top sheet if there's room, but I'm desperately keen to avoid modifying bodywork. The plan is to have the car look standard at a glance (except the wheels and brakes) and also for everything just to bolt into a standard E30 shell should the worst happen.

Have done my spread sheet for the ratios, think you can fit a 3.07 ratio diff from the E28 to the E30, and I believe (correct me if I'm wrong) that the Sport diff is a 3.63:1?

Anyway, this is what it comes up with. Doesn't look toooooo bad, although a slightly taller diff wouldn't go amiss. Anyone know if one's available? Mabey less than 3:1




Think my maths is about right, here's the equation:
=((A2*(1/B2)*(1/C2)*D2)*60)/1609

[march109]

Hmmm, Alex I could have saved you 10 mins on that spreadsheet.



Tyre sizes ect are all pre programed in too. So no need to work out circumfrances of tyres.

[Speedtouch]

Later (Tech 2) Sports are 3.91:1 diff

[Turbo-Brown]

Bugger, didn't know there were things like that out there! Couldn't e-mail me a copy could you Gareth?

Hadn't realised the later cars had a lower ratio, Brown had a 3.63 (or whatever the normal 325i non-sport diff is) with a Sport 'box and the ratios were just to my liking with 30mph being about 1400rpm in 4th and 70mph being just shy of 3000rpm.

With the diesel 'box and a 3.07 diff I'm looking at about 1700rpm for 30 in 4th (or about 1350 in 5th! ) which would make 70mph a pretty unbearable 3150rpm.

Still, should make pulling away easy with that super low first gear

[march109]

I'll zip it up and post it on my website and PM you the link to download it from.

Edit - you have PM.

[Turbo-Brown]

Awesome, cheers dude

[Turbo-Brown]

Fantastic, cheers Gareth

That's well handy! Wonder if 245/36R17 tyres would fit on the back of the car. Should go on an 8J rim I believe and would give about 1300rpm at 30mph (in 5th) and just over 3000rpm at 70mph which sounds live-withable.

Or 235/40R17 tyres push the engine speeds down a fair bit, but the tyres are a good chunk more expensive, guess it's a less common size or something.

[appletree]

Dont know if you've got anything sorted for the charge cooling rad for the front of the car but ive just bought a jag XKR S/C one as an upgrade for mine, its 59cm by 31cm (not including inlet or outlet) and has 15mm o/d inlet and outlet which is very near the max size you can fit in an E30 with out moding the front.

I payed £70 for a used but very good condition one but they do seam to go for alot of money for what they are but they are made for the job! if you want some pics let me know.

[Turbo-Brown]

Certainly be interested to see some pics Matt

I've been thinking of using a motorbike rad of some sort as I imagine they're fairly cheap and efficient.

Always open to new suggestions though

[Gunni]

Fantastic, cheers Gareth

That's well handy! Wonder if 245/36R17 tyres would fit on the back of the car. Should go on an 8J rim I believe and would give about 1300rpm at 30mph (in 5th) and just over 3000rpm at 70mph which sounds live-withable.

Or 235/40R17 tyres push the engine speeds down a fair bit, but the tyres are a good chunk more expensive, guess it's a less common size or something.

245/35 fits with rolling, in the back you can run ET from 15 upto 30.
ET15 looks best

[Turbo-Brown]

Sweeeeeeet, got ET20s for the back and about ET22 on the front (I think, will have to dig out the drawing) so all should be well.

So should be alright with 245/35R17 on the back and 205/40R17 on the front, both on 8J rims but it's all I could get at the time.

Cheers for the info Gunni

[Turbo-Brown]

Good news and bad yesterday.

Good news is that the rods, stud kits and head gasket were shipped yesterday

Bad news is that I got the sample flywheel back and checked it against my spanky new fly. All the dims check out except that they've machined completely the wrong number of teeth on the ring gear

When will it end?!

[appletree]

Few pics of the fitting of my new charge cooler for you

Made for the Job!






Holes in the right place for a nice easy bracket!




Fits perfect between the two brakets, nice tight slot






My old one Volvo 440 auto box fluid cooler

[appletree]

Ive typed that like its my thread , its just a few ideas for you alex

[Turbo-Brown]

Blimey, that's a big ol' rad!

Good fit too! Will keep 'em peel for one of those, cheers Matt


Ooh, got a box of shiny bits yesterday!

Got an ARP head stud kit, ARP main stud kit, MLS head gasket with standard thickness and an 85mm bore and, most importantly, these:






Think they're absolutely beautiful" Such a shame to bury them in an engine!


Done some more work on the charge cooler today too. Unfortunately took my welder away from my parents house so I couldn't do much more than this:











Took the suggestion of putting a bend in the top sheet to open up the area the air gets to flow through. There's a tiny clearance issue at the very front so I'll need to lop the corner off and plate over it, but other than that it all seems to fit in fine! Avoids all the coolant plumbing, servo, only other slight clash is the C101 connector but really not too fussed about that

[maggspower]

Top job!!! those rods look nice how much do they weigh? are they lighter than the m20/m52 rods you were going to use?

@Turbobrown pm sent

cheers maggs

[march109]

Alex !!!!!!!! Woohoo, how much do I owe you for postage to me for the rods? We all square on the rods or do I oe you more?

Maggs they are lighter than the M52 rods, which in turn are lightler than the M20 rods, the cost was very reasonable thanks to the strong £ versus the $ and good for 9000 RPM and 750BHP according to the manufacturer although a chap in the U.S is using the same rods on something pushing out quite alot more than that.

[maggspower]

Thanks march109, what sort of £Â£ are we talking, pm me if you want.

9000rpm

cheers maggs

[march109]

TBH can't remember just know I thought the price was very very good, Alex will be able to tell you ho much exactly as I'm waiting him to send me the final bill, but IIRC less than about £290 inc shipping from the states.

[Turbo-Brown]

Will work out the bill tomorrow if that's alright Gareth

Got clobbered for VAT and Duty unfortunately.

Still gonna end up being insanely cheap though