JBrad

I dont know if you guys can help me or not but i was wondering if a IS250 manual transmission bell housing will bolt onto the IS350 2GR-FSE engine? I was looking try convert my 350 into a manual and wanted to know how much work was involved.

mtnduc

I have no idea but I'd guess there may be serious reliability issues based on the HP increase.

ISbb

I don't think so since the power of a IS350 engine is greater than a IS250 the Trasmitsation will broken after a while...

HKS350

iTrader: (4)

yeah it should fit,but fitment isnt the issue.you would have to think about wiring,what computer,and how to control all of your new parts!you can bolt anything together. hell you could even get a custom bell housing and run a supra 6 speed v-box,but without a standalone EMS it won`t work.

gsrthomas

iTrader: (1)

Is the Auto tranny on both IS250 and IS350 the same???

HKS350

iTrader: (4)

probably not,just the case and gear set but different clutches,valve body,and torque converter.

tqlla3k

iTrader: (1)

people did Auto to Manual conversions in the 3000GT. So hopefully it will work here.

MT cars dont require computers like AT cars, so hopefully, you can just bypass/remove XYZ computers.

get a strong clutch, and a Transmission shield.

While the IS350 is very strong compared to a 250... the 250 MT will probably be able to hold the power. IE, my AWD 99 Eclipse which had stock 150HP-160HP to the ground... did fine when the car had a huge turbo(It put down 266HP on 93 octane@18PSI/ 323HP@104 octane@23-24PSI) .

323AWHP to the ground is a lot more stress on a tranny than 255RWHP(to the ground). I would think that Toyota's 6-spd MT(204HP) is built as strong as a Mitsu 5-spd(210HP)

It will be a hellacious time trying to figure out how to get it to work. BUt I am certain that it can be done. GOOD LUCK

Soda

Wow, you're car will be worth absolutely NOTHING if you were to do this. If you want a manual, I'd suggest a 335i...

krazykanuk

Thats what I was going to say, just buy a 335i if it means that much to you to have a manual.

combfilter

iTrader: (3)

Yea, the glove box is the same size on both the 250 and 350. It should fit right in there.

Ramon

Sorry, but everything you just said about what the tranny may be able to handle is a compelete guess on your part. Do you have any actual facts on what the tranny can and cannot handle? Unless you have some solid facts or at the very least some good evidence, telling someone "it should work" is very bad advise.

istundra

iTrader: (2)

i think it would be more feasible to drop a 350 motor into a MT 250 considering all the MT wires and pedals are present.

tqlla3k

iTrader: (1)

People in up the boost, and turbo and SC NA cars all the time. Most they do to the tranny is .... change the clutch, and these car are usually hondas/acura, toyotas, Mitsu's and suby's.

Really 260RWHP isnt that much HP. A lot of people seem to think that these cars... a toyota built lexus BTW... are built to the absolute minimum necessary.

Its possible that Lexus's 6-spd transmission will destruct and send gears flying at 260HP.... but higly unlikely.

IS350jet

It's not horsepower that kills transmissions, it's torque. 244 @ 4,400 rpm is not that destructive. I would think the manual transmission in a civic could handle that.

tqlla3k

iTrader: (1)

It would certainly be easier to find a wrecked or rolled IS350, than it would be to find a wreckect MT.

There was a guy on ebay parting a 350 out a week ago.