yepp! lol kinda hope you do it so i can see how it goes......lol

i want to go turno bad but just dont have the funds to do it "right"

last car was 91 crx auto that i boosted to 10-12lbs. blew frist motor due to tunning it wrong and on the second jdm vtec motor i blew the tranny lol. all in alll dumpd probly 8k in to that pos. yea i had 250+ hp but no tq at all. and the car was super light. it was gutted.

 

I am waiting on funds. I want to do it all at once. Within 6 mo or so i should be able to do it. I will definatly keep you updated. Its a matter of time, but i am going to do it. Thanks for recommending to stay auto makes me feel a lot better about me orig. wanting to stay auto.

Dustin Clark

 

AFAIK drivetrain losses are better represented as a constant value rather than a percentage. Import Tuner dyno tested a 08 XB AT and got 125 whp stock. Since we know that stock BHP is ~160, that gives us ~35 hp drivetrain loss for the auto XB. IMO this is the best figure we have to use. So 150 WHP equates to 185 BHP on a auto XB.

To the OP:

Since you already have the Unichip, you might consider the Descendant "tuner" kit from TRD Sparks for $2850. All you need to add are 550cc inj's, gauges and a tune. Add a good trans cooler, syn ATF and you can run 250 whp through the stock U241E. This should net you high 13's in the 1/4 mile and < 6 sec 0-60. If you later decide that it's not enough, you can always send your trans to IPT or Level Ten, raise the boost and re-tune for 300 whp.

 

Thank you scion fred for the info. I was aware that the auto was just about 25 less to the wheels =(

Quick question do you have an idea how much Hp the built trannys can hold? it looks like lpt sells you a tranny for 3200 obo? and Ten takes ur car and rebuilds the current trans?

My ideal is 350 to 400. Either way i would add a tranny cooler. I plan on doing rods / pistons. However curious what a safe PSI is without having to do head work.

I have read a lot of your posts scionfred and i really appreciate your input. I appreciate both of your inputs. Thank you!

On the tuner kit, how do you feel about the side mount? i do have the TRD CAI vent that would work for it. Thanks ScionFred!

 

I'm not really sure how much tq a built U241E can handle. You should call them and ask. I'm pretty sure that both companies re-build your trans and don't stock them.

I think you can run 400 whp with stock sleeves, better pistons and rods, return fuel system and 750cc but you should visit the TC1 FI forum for better info on that kind of power and boost.

I have a SMIC and really like the stealth aspect but for 400whp I think you might be better off with a FMIC instead. Descendant also offers a FMIC kit. Call Rob and ask him.

Good luck with the build.

 

all i know scionfred is that your sig is in danger! lol

"14.33 @ 96.6 mph (World's fastest AT Scion XB?)"

 

That's okay, it's lonely at the top! lol

 

So scion fred i thought of something here. One thing i notice is this is the same engine that is in the corolla xrs 2.4l. They have a 5 speed seq shift auto we have a 4 spd. Im pretty sure it would fit, my question is how hard would it be to add the extra gear in the cpu / and put the right gear ratio in and what not.

I was thinking it might be stronger than the one i have, 5 gears should be better acceleration since the xrs is geared pretty aggressive.
Thanks!

got some info here it would be the u250e and i guess i have the u241e checked the gearing ratio on both and xb auto is like a final of 3.2 or something and tuned for mpg the u250e has a 3.6 final and more aggressive tuning.

Dustin

 

the 5 speed auto and the new 6 speed auto bolt up to the 2azfe just fine. bit nether one shar the same mounts. so custom tranny mounts would be needed along with ecu, probly new or custom axels and maybe even a new wiering harnes. i looked into this a wile ago and if it were me i would go for the 6 speed and not the 5. if you have the money world motor sports will make you a swap kit from 4 to 6 speed auto. they alredy have done the 5 to 6 speed manual on the tc

your looking at probly 3500-4500 to do the swap to ether tranny

 

Thats not too horrible. Question being would it be worth it. Would it give me that much more speed / and could the newer 6 speed transmission handle more max hp?

Thank you so much for your info, you saved me a lot of time lol.

also that would be the u760?
or is it U70E?

 

The 6 speed is the u760 I think. Nether one will give you a faster topspeed as the ecu will still cut you off. The unichip fixes that by removing the speed limiter.

No one is 100% sure the 6speed auto will handle more power or not. But it will net higher mpg and a smother ride.
I think it would be worth it for the 6 speed auto.

 

i more meant quicker acceleration by gearing. (If thats possible) Smoother ride would be nice, but for 4 grand? only thing is, i would end up having to build the 6 speed tranny up which would be another 2 to 3 grand. Definatly something to consider and think about. I would love the extra mpg.

 

Yea 4 grand on top of a realistic 4 grand for a strong tranny. Now your up to 14k for the build.

 

Yes to me not quite worth it for smoother shifting and maybe a little better exceleration. I don't drive that far the distance. I think I would rather best that money in suspension and a few other things. I don't really wanna get to overboard.

 

IMO the biggest challenge to swapping in any new auto trans would be the ECU/TCU. Since you can't re-program the ECU you'd have to swap in a the ECU from the trans donor vehicle and hope that the harness pin-out and the rest of the ECU programming works with your XB.

Perhaps IPT, Level Ten or World Racing might have some better ideas.

 

^ this is my thought too. now if i was never to go turbo then yes i would put the 4k for the swap in a heatbeat. but thats just me.

 

My thoughts on the trans swap are the opposite. Since adding the turbo my trans never has to downshift even on the steepest, longest hills. The speed limiter kicks in way before the engine runs out of revs. I just don't see any benefit other than mpg but since it would take 300,000 miles to recover the swap cost in fuel savings, why bother?

 

you make a good point on the fuel. the bigest thing i would say is if the newer tranny is stronger and can hold more whp stock. but 4k could be put towards the 4speed build up and that has to be better than any stock tranny could be.IMO

 

Not to mention that a 4spd AT to 6 spd AT swap is very likely impossible without cooperation from Toyota to re-program the ECU/TCU. I suppose a 4 spd AT to 6spd MT swap might be possible with an ECU swap but why? If I wanted a MT, I'd trade my AT XB in for a MT XB and go from there. Some of the fastest 1/4 mile cars use 2 spd powerglides. You lose ET with every shift so you need to gain a lot from the extra gear ratios.

BTW, for the fuel savings I assumed a very generous 10% improvement in mpg and $4/gal gas to arrive at $3636 in fuel cost savings over 300,000 miles.

 

God i tell you what, you guys make this so much easier for me thank you!! Either of you guys live in cali?

Dustin