Likewise. 4 - 3 is sometimes an issue for me.
[quote=N17VES][quote=ade]you can run as small as a 2.5" pulley but you are then running just above its max RPM at 8k rpm, I am going to try a 2.6 and 2.7" pulley and see what difference there is in power, but I will probably stick with the 2.7"
not convinced by the 1320 harrop as I feel it is a bit large for the job and doesn’t give the low down performance results sadly [/quote]
Why do you think the harrop is too large? I’ve been in a couple of harrop cars, and they are quit impressive! You do loose the superhcarge whine though…
Not sure about running smaller than 2.8" with the MP62…I think its pushing it a bit far. I’ve got the calcs somewhere, I’ll have to dig them out. [/quote]
The Elise S runs the MP45 not the M900 TVS as far as I know.
I did talk with a buddy of mine that works for Magnasun and he said the M900 will be out soon as a direct bolt on replacement for the MP62.
You loose supercharger whine because those TVS1320 blowers are bearly making any boost… They are designed for much higher boost levels then what guys are runing. They should be putting out 20-24 psi. on a 1.8 ltr. not 10-14 psi.
[quote=frank][quote=N17VES][quote=ade]you can run as small as a 2.5" pulley but you are then running just above its max RPM at 8k rpm, I am going to try a 2.6 and 2.7" pulley and see what difference there is in power, but I will probably stick with the 2.7"
not convinced by the 1320 harrop as I feel it is a bit large for the job and doesn’t give the low down performance results sadly [/quote]
Why do you think the harrop is too large? I’ve been in a couple of harrop cars, and they are quit impressive! You do loose the superhcarge whine though…
Not sure about running smaller than 2.8" with the MP62…I think its pushing it a bit far. I’ve got the calcs somewhere, I’ll have to dig them out. [/quote]
The Elise S runs the MP45 not the M900 TVS as far as I know.
I did talk with a buddy of mine that works for Magnasun and he said the M900 will be out soon as a direct bolt on replacement for the MP62.
You loose supercharger whine because those TVS1320 blowers are bearly making any boost… They are designed for much higher boost levels then what guys are runing. They should be putting out 20-24 psi. on a 1.8 ltr. not 10-14 psi.
[/quote]
Frank - The 2012 elise S is what I was refering to (as in the one revealed alongside the new v6 Exige). Thats suppose to be running the M900, which suggest it will be out very soon.
I understood less torque rating ??
Here is the advertising blurb copied from monkeywrench…265lbft
Jubu Racing C6X Gear Upgrade - 3rd+4th Helical
[JRA-430712]
Finally, a simple inexpensive gear upgrade for the C60 family of Toyota 6-speed transmissions. It’s well known that 3rd and 4th gear are the weakest points of the stock 6-speed so we’re addressing that problem with new, stronger gears for those positions. These gears are helical cut so they’ll sound similar (though slightly louder than) stock and are synchronized so they’ll drive just like stock. Ratios are slightly longer than stock (1.438 and 1.105) which equalizes the gear spread and improves performance in higher speed situations.
Power rating: 400hp and 265 ft-lb when used with an upgraded final drive (Kaaz, etc).
The TVS1320 is a bolt on upgrade for the M62 charger in the Chevrolet Cobalt (2.0).
This is the same engine as fitted to the vx220 (2.2), but with a longer stroke to increase displacement. I’ve been in a few M62 supercharged vx220’s and the ones running the 1320tvs. The 1320tvs cars run very well indeed!
…but the M900 is probably the best solution if its a direct replacment.
[quote=N17VES][quote=frank][quote=N17VES][quote=ade]you can run as small as a 2.5" pulley but you are then running just above its max RPM at 8k rpm, I am going to try a 2.6 and 2.7" pulley and see what difference there is in power, but I will probably stick with the 2.7"
not convinced by the 1320 harrop as I feel it is a bit large for the job and doesn’t give the low down performance results sadly [/quote]
Why do you think the harrop is too large? I’ve been in a couple of harrop cars, and they are quit impressive! You do loose the superhcarge whine though…
Not sure about running smaller than 2.8" with the MP62…I think its pushing it a bit far. I’ve got the calcs somewhere, I’ll have to dig them out. [/quote]
The Elise S runs the MP45 not the M900 TVS as far as I know.
I did talk with a buddy of mine that works for Magnasun and he said the M900 will be out soon as a direct bolt on replacement for the MP62.
You loose supercharger whine because those TVS1320 blowers are bearly making any boost… They are designed for much higher boost levels then what guys are runing. They should be putting out 20-24 psi. on a 1.8 ltr. not 10-14 psi.
[/quote]
Frank - The 2012 elise S is what I was refering to (as in the one revealed alongside the new v6 Exige). Thats suppose to be running the M900, which suggest it will be out very soon. [/quote]
Got ya. The M900 TVS will be a direct replacement for the MP62 Magnasun is finishing up their castings…
I may add the M900 in place of the MP62 just to see for myself…
I understood less torque rating ??
Here is the advertising blurb copied from monkeywrench…265lbft
Jubu Racing C6X Gear Upgrade - 3rd+4th Helical
[JRA-430712]
Finally, a simple inexpensive gear upgrade for the C60 family of Toyota 6-speed transmissions. It’s well known that 3rd and 4th gear are the weakest points of the stock 6-speed so we’re addressing that problem with new, stronger gears for those positions. These gears are helical cut so they’ll sound similar (though slightly louder than) stock and are synchronized so they’ll drive just like stock. Ratios are slightly longer than stock (1.438 and 1.105) which equalizes the gear spread and improves performance in higher speed situations.
Power rating: 400hp and 265 ft-lb when used with an upgraded final drive (Kaaz, etc). [/quote]
I thought it was 400nm, 295ft-lb. Hanger 111 and sector seem to quote that too, but its hard to understand from Jubu’s own website. 265 is still a pretty good figure though, when 300bhp equates to only 200ft-lb.
Side tracking again…the 2012 elise is using a new gearbox - EC60. It can handle 180ft-lb in standard form. Not sure if its interchangable, but probably worth looking into.
Thank god for dodgy super chargers and their crap torque figures 
307 bhp = 212.5 ftlb in my application…
More boost /less ignition than Sincs 2.9 conversions perhaps
Probably why the box only lasted 200 miles 
[quote=jfk]307 bhp = 212.5 ftlb in my application…
More boost /less ignition than Sincs 2.9 conversions perhaps
Probably why the box only lasted 200 miles [/quote]
My sincs graph is 272whp and 182ft-lb at the hubs - just found it. Who mapped/dyno’d your car? Is that a 2.9" pulley?
Lotus factory mapping ! (Standard 260)
2.8 pulley
Own sized injectors to match fuel with boost …
[quote=N17VES]Sound like adjustment. If it was syncro its more likely to go on say just 4-3, not 2-3 also.
Best way to check if its syncros is to double clutch the change going up and down the gears (steve mcqueen style lol) to see if it still does it. [/quote]
Just been out in the pi$$ing rain and no change with double clutching still grates. After few miles change is fine.
Give me some good news please
Steve
I doubt it’s related to your 260 upgrade - my cars got the same box straight from the factory so should be OK. I’d go for adjustment first - also have you had the std crap g/box oil changed ? - that makes a huuuuuuuuge difference for �40
C
Hi Chris
Yeah had the oil upgraded when car was 3 months old and changed again 18 months ago when CN did the upgrade.
Hoping it is adjustment.
Steve
I’m pretty much in the same boat as many are. Have had a brief go at adjusting the cables after new gearbox oil. Have improved 3-4 but 3-2 is shite, nasty grind.
Is there a tried and tested technique to adjusting the cables?
Sorry for the slight thread drift but you cant mention power without gearbox issues 
Cheers
John.
[quote=JP1]I’m pretty much in the same boat as many are. Have had a brief go at adjusting the cables after new gearbox oil. Have improved 3-4 but 3-2 is shite, nasty grind.
Is there a tried and tested technique to adjusting the cables?
Sorry for the slight thread drift but you cant mention power without gearbox issues
Cheers
John. [/quote]
Syncro issues are not power rated. I had a synro go on 3-2 (was fine 2-3 as they are differnet syncro rings) It would not go into gear easily at all, and would grind for a couple of second before engaging. The reason for it failing was engine braking at high rpm from 3-2 on track - Its too much for the weak syncros to handle. The solution was to double clutched every downshift to get a perfect shift without grinding.
Now I’ve had the gearbox rebuilt with new syncros, I make sure I double clutch (not just blipping the throttle with heal and toe) to make sure I don’t wear another syncro out.
I’ll have to try double clutching next time I take it out, sounds like a ball ache in practice tho.
Its still a shame we have to drive around the problem as there is no real solution to our cheese geaboxes. Might just buy a stock of celica geabloxes and practice box swaps
Getting back on topic, I know a chap called Patrick Mortell from my MR2 turbo days. He runs rogue motorsport, an MR2 specialists.
From what I remeber has a bit of experience turbocharging the Mk3 MR2 lumps ( I assume they are the same engine).
He may well have a different spin on what can be done.
What can be done has been done years ago on these cars… So far everything that can be done is on my car… 
Quick question for you Frank, what sort of diameter exhaust system did you used to run before you went turbo?