Is my T70 too big for DOHC 4.0L?

[Unfalconbelievable]

I've decided to go with the new BA ford DOHC 4.0L for my turbo project as they are only a fraction more than what I was going to spend on the 250 bottom end anyway. $5000 for a crate long motor minus manifolds! Is the T70 I've described in earlier posts too big for the flow of this motor? I would imagine with the huge flow of the 24 valve motor that the T70 would be alot better match and spool reasonably early compared with the 250 pushrod engine.

Any ideas????

 

[sefus]

I'll put it like this. In Boise last weekend my buddy's T-70 on his stock block 5.0 wouldnt start spooling till 3600rpm with a heck of a good flowing tubular header and exhaust system. two turbo coupe IHI's on a stock 5.0 will start building boost around 2500rpm. A t-66 or T04b is what you might want to look into, imo.

 

[Anonymous]

THAT IS NOT A T70!!!!

What on earth are you trying to prove by starting a new thread? I read through the other one again and it looks like you are asking tha same question over again!!



You seem so convinced that this chinese turbo is going to work for you.....since you ALREADY have your mind made up, go ahead and install it then get back to us with your results.

 

[Unfalconbelievable]

Maybe you didnt notice that I'm now buying a DOHC 24 valve 4.0L I6 that will have heaps improved head flow than a 250 or SOHC I6. I thought this might improve spool time by maybe 500rpm which would bring it into around the perfect range for what I want. It still has the same wheel sizes and A/R's as a T70 and so should spool around the same. Notice I didnt say garrett T70 fool.

 

[Anonymous]

1) The DOHC six is really sweet. I commend you for getting you hands on one.

2) The turbo really sees cubic inches, I doubt it would spool any faster. Maybe 500 faster is a good guess. Possibly.

3) "It still has the same wheel sizes and A/R's as a T70"

No, it doesn't - - NOT the same as a REAL T70.

a) What A/R on the turbine sidehousing?
b) What is the ACTUAL inducer size of compressor wheel?

4) "Notice I didnt say garrett T70 fool"

It is NOT a T70.
I don't give a rat's behind if you did say Garrett, it isn't a T70.
Call it something else.

5) Are you sure you want to risk ruining a preium quality DOHC engine with that crappy turbo? Do what ever you want to, it seems you have made up your mind already and are just looking for confirmation of your decisions.

 

[Anonymous]

Boy..what an angry post...

 

[Anonymous]

Boy..what an angry post...

Back tech has no place on the internet, there is enough out there already floating around without adding to it..

I'm all out for helping the guy, but he isn't supplying any usable information.

 

[Anonymous]

This is the number one reason you should NOT use this turbo on your car

7th post on the page Ford escort forums

They literally FALL APART!!! The compressor housing is epoxied together!!! NO bolts hold it in place. No housing = no boost for joo!!! You wont get a refund either. My advice would be to put it back up on E-bay the minute you get it in the mail.

The best quote I can come up with for this situation came from a turbododge guy talking about these turbos: "The bitterness of poor quality lingers long after the sweetness of cheap price is forgotten." How very true! This just goes to show that you really need to do your homework before buying ANYTHING that is not well known.

EDIT:
A good source for great turbos is turbosunleashed.com

 

[Unfalconbelievable]

Well where was everyone when I asked about what turbo would suit my application?, I posted here asking for a suitable turbo for a 250 going for 500 crank hp at preferably less than 5500RPM. No one supplied useful info beside "BIG". I searched and came up with zilch in this sort of horespower range, then while searching on E-bay I found this piece of sh*t turbo that was "BIG" and cheap and new. I posted about it and noone warned me so I bought it! Now I've got the task of selling this hunk of junk and buying a T04E or B at a reasonable price. So just confirming, I want a T04E with .6 exhaust and .5 compressor or around about?

 

[JP]

Check out www.turboneticsinc.com web site for guidline sizing.
jp

 

[Anonymous]

Check out www.turboneticsinc.com web site for guidline sizing.

This site will also be very informative:

http://www.turbofast.com.au/welcome.html



The whole turbo scene is NOT a "get rich easy" (read: "go fast easy") scheme. It requires more patience to get things sorted out than you can even begin to imagine.

Well where was everyone when I asked about what turbo would suit my application??

Knowledge is your weapon, and by doing reserch and asking questions you will gain knowledge.......but it will not happen over night.

Not even in one month.

It will take several months to absorb the info you need to make a turbocharged engine run fast and stay alive. AND it will take a lot of dedication "to the cause". If you give up on the first failure you will never reap the rewards.

And it also helps to have a spare engine or two for when you blow one up (speaking from experience, here!) I may be so bold to say "there are those who have....and those who will".

In fact I KNEW that getting into this whole principle that I would never find the maximum limit of the engine until it was pushed all the way to its limit. But that is fine by me since I knew it going into it. I am in the process of building a bigger, badder, better version to debut this spring.

No one has all the answers for you. But you will get answers a little at a time when you go looking for them. And don't try to get all the answers from one place.

It is a bitter path covered with thorns but there is no other way to get to the pot of gold. You can make a six fast with traditional hot rod methods, but you will never make one BLINDINGLY fast until you have a turbocharger on one.

Good Luck - and keep us informed.

 

[George]

Unfalconbelievable,

Why not use the factory GT40/35 that comes standard on these engines?

You can pick them up for about $1200 if you know the right people.

This will easily give you 500hp.

Ford has done the hard work for you, trust them!

Regards

 

[Anonymous]

hey dudes
i have a 2005 xr6 turbo ute 6 speed and i'm going to modify the motor for circuit racing duties. Problem is i'm not sure whether the standard crank should be kept as the motor will be reving to 8000rpm +. Is there any aftermarket crankshaft suppliers for my motor?

 

[Unfalconbelievable]

Why do you want to rev the motor to 8000rpm??? big RPM isnt a must for big power and torque, moving your torque range higher will give you more power yes (power is torque multiplied by rpm and a couple other things, the higher revs the torque ranges is at the more power) but its not as useable, if you can make the power without the revs by all means do it man because its heaps cheaper. The XR6T DOHC donk will stand up to 8000RPM but you'll need better and mostly lighter rods/crank/pistons. And the head will more than likely need porting to get that sorta flow out of it, cams will need to be changed, your looking at $10,000 to 15,000 base rate for the engine before you look at manifolds and turbo selection. Keep the revs down and focus on torque, revs are wank factor only, a 1600 can make 400hp but its torquerange is between 8500 and 9200 rpm! how is that useable even as a circuit racer? a 4.0l six can make 700hp and have torque between 3000 and 6500rpm, and heaps of it like 850Nm

Much better Think about it, revs are wank factor, if you can make the power with out them then you've got a far superior engine that will last longer

 

[Anonymous]

well the motor needs to rev abit higher to increase its useable power range. Race down shifting also will mean that it will reach 8000rpm. I just want to know if the factory crankshaft is going to surive at these speeds continuously. The engine is turbocharged so the flow at these speeds though the head will be useable, and i am upgrading the turbo too. I want around 650kw max. All i want to know it that is the factory crank strong enough?

 

[Anonymous]

Thinking again maybe limit it to 500rwkw on pulp and 600rwkw on avgas. Does that sound more reasonable?

 

[Unfalconbelievable]

Hmmmmm still 8000RPM is still alot. And i dont think the standard crank will last long at 600rwKw or 8000RPM, considering its stock intensions were 180rwKw and 7000RPM. An extra 1000 RPM is alot at these levels and you're talking 850-900Kw (1100hp) at the engine! Yes the BA DOHC is capable of this but not the stock internals or the stock head/valve/cam assembally champ. The only thing you wont have to touch is probably the block, and even then you might as well give it a bore while its appart to get some cubes to help with the power expectations

 

[Anonymous]

yeah i've been thinking and the falcon is really not designed to be a race car. I will just set it up for drift and get the max power that a piston and conrod upgrade will allow. I might have a buy a cheap ass r32 gtr thats already been modifed for racing.

 

[George]

I personally would not be reving the standard crank over 6500rpm for too long - especially it its going to be pushing out over 500 hp.
We must remember that these are still based on truck engines!

I ran 11.4@116mph down the 1/4 with my 250turbo and didn't rev it over 5000rpm.

Good luck

G

 

[wallaka]

We must remember that these are still based on truck engines!

No they're not... The newer Aussie 4.0 is designed for much higher revs than an American 250...7000 rpm stock vs. 4000 or so. If you have the capability, why not use it? More RPM=more HP.