Putting a set of Twins on this week

[Huff N Puff]

Looking for feedback,from the guys who have a set. Right now the truck is a 2001 auto. 4wd with an Hx40,able to putout 48lbs of boost and ddIII's with an edge comp drag module. It also has one of DTT's best with a 91% converter. What do I regulate boost to , and what else do I need do . We are turning 13. 4 in the 1/4 mile. my 60Ft times are in the 1. 8s. I was wondering what to expect if anything in improvements in the bottom end performance. Would appreciate any feed back. Merv.

 

[Mark_Kendrick]

I'm betting 50 psi is enough

 

[Gizmo 007]

I'd say keep boost around 50 ~ 60 psi... I've blown too many head gaskets over 70psi. Of course, mine is a high output, and the higher compression is a pain.



My spool-up suffered slightly when I went from a dead stop with the twins ... BUT if I power brake and build a little pressure, launches are hellacious and spool up is INSTANT! With transmission in neutral, at 2000 RPMs, i can build 6psi boost no load with the twins... kinda cool



P. S. - I am running a different combination of turbos than anyone else, so results will vary



GOOD LUCK!!

 

[Mark_Kendrick]

Merv,

I wonder if your tubes will look something like this?



www.texasdieselworks.com/mervstubes/



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:-laf:-laf:-laf

 

[J.R. Adkins]

Merv,



First of all congrats on the twins!! How much boost you want to run should depend on several things. What kind of head gasket system do you have now or are going to install down the road? If you don't want to replace the stock gasket now I would say limit your boost to LESS than 50 psi. Boost is also a measure of back-pressure. For-instance, When I replaced my stock cyl. head with a over sized gasket and a PIERS stage 3 head I lost some boost. Part of this was due to the lower compression due to the thicker head gasket. And the other part was due to the fact that the stage 3 PIERS head did flow better than stock. The next thing that you need to look at is your turbos efficiency. IE:If your large charger is the most efficient at 20 psi, then you need to run a exhaust housing that will run it right in that range. Your system will be more "tuneable" if you run a turbo on the manifold that has several options for the exhaust housings. Then after you get the system set up where you want you can set the wast-gate and leave it alone. Your large charger should have several options on the exhaust side also. You will have a lil more lag with the twins because you are losing some of the exhaust energy to spin two turbines instead of one. Also you have an auto with a tight converter. That will affect spool-up to some degree also. Like Gismo said... ... once they light... ... it's off like a rocket!! You will have to move the trans cooler to another location to make some room in there. Some people remove the passenger side battery. If you live in a cold climate you might want to keep a set of jumper cables on hand, and possibly keep the truck plugged in at night. Personally I like the second battery. I have several amps under my drivers side seat and like to turn up the music some. You can move the passenger side battery to the drivers side and keep them booth with some modification. The drivability of twins are just unbeatable!! I have now built several set's of twins and the fun just never stops!! Have fun and good luck to you!!



J. R.

 

[Sled Puller]

My first set of twins all but eliminated ANY lag, light to light was incredible.

Could it be the tubing design?

 

[J.R. Adkins]

Seeing as how I moved up a housing size, yes there was more lag... ... ... . If i wanted to run smaller housings SPOOL UP WOULD BE CRAZY. Now go away Genie



J. R.

 

[Mark_Kendrick]

try an HY30-9 on top!!!



:--) :--) :--) :--) :--)

 

[Huff N Puff]

Thankyou:

Mr Kendrick, Mr. 007, Mr Adkins,Mr Sled Puller. Thankyou all for your input. Talking to guys like you make me glad I'm a member of the TDR. You make learning about as much fun as riding in our trucks. Merv

 

[Sled Puller]

Originally posted by J. R. Adkins

Merv,



You will have a lil more lag with the twins because you are losing some of the exhaust energy to spin two turbines instead of one.



J. R.

???????

 

[Mark_Kendrick]

He's referring to the single turbo alone.



a set of twins using a HX35-12 will be slightly slower than a HX35-12 alone on the bottom side.



once they're lit, WHOA NELLY!!!!

 

[J.R. Adkins]

Thanks Mark!



It looks like Genie either does not know a thing about twin turbo's or he just does not like me . I think its both!! Mark we must be cutting in to his profit sharing!!



J. R.

 

[therabbittree]

ok guys how will a twin set up using a h1c 18. 5 exhaust side and a hx55 with 22cm exhaust side sound?... . for the small turbo the stock '89 h1c with 18. 5 is cheap as its on the truck . . i also have a hy35 9cm exhaust if it wanted to play... .

fuel is 12mm plunger p pump, enterprise lasercut d valves, 370s, and a #4 plate or none or custom homemade close to # none plate... ... . ???? ideas?

thanks

deo

 

[J.R. Adkins]

deo,



What are your plans for the truck??



J. R.

 

[therabbittree]

driver but drag race it and do some local tractor pulls etc. . snowplow and haul my crap around... basically i would liek to have a really sick powerful first gen. . if i could turn 12sec 1/4 mile times it would be perfect i guess thats my ulimate gol run a 1 sec flat 1/4mile in a 4x4 first gen that i could snowplow with if needed and use to haul some of my crap... i know thats a tal order but i think it might be possible eventually... . the body is a little beat so it will be my sleeper . .

big power on a hillfolk budget



any ideas?

thanks

Deo

 

[J.R. Adkins]

Those twins should make some boost and still spool well. GOOD LUCK!!



J. R.

 

[Sled Puller]

Originally posted by J. R. Adkins

Merv,



You will have a lil more lag with the twins because you are losing some of the exhaust energy to spin two turbines instead of one.



J. R.

Originally posted by Mark_Kendrick

He's referring to the single turbo alone.

I must be a dummy, becuase those two sentances make no sense at all.

I have not seen pictures of yours JR, are you running them parralell??





Anyway, my original set up was an H3 and a 35/16. All I know, is that set up would smoke a single 35/16 on spool up, we are talking like zero lag. Even with a big cam and high timing.



Maybe I totally misread your post.

 

[Mark_Kendrick]

Originally posted by therabbittree

ok guys how will a twin set up using a h1c 18. 5 exhaust side and a hx55 with 22cm exhaust side sound?... . for the small turbo the stock '89 h1c with 18. 5 is cheap as its on the truck . . i also have a hy35 9cm exhaust if it wanted to play... .

fuel is 12mm plunger p pump, enterprise lasercut d valves, 370s, and a #4 plate or none or custom homemade close to # none plate... ... . ???? ideas?

thanks

deo

Use the HY30 and a BHT3B-26 or 22 and an external wastegate.



and yes, they will spool faster than you can imagine.

 

[J.R. Adkins]

Originally posted by Sled Puller

I must be a dummy,

Maybe I totally misread your post. [/B]

Yes i agree, you are!! You must have missed the post below.

Originally posted by J. R. Adkins

Seeing as how I moved up a housing size, yes there was more lag... ... ... . If i wanted to run smaller housings SPOOL UP WOULD BE CRAZY. Now go away Genie



J. R.

HOUSING CHANGE!!!!!! BIGGER HOUSINGS = more lag!! Gesh:rolleyeyes:





Gene,



So tell me how your sponsorship works with "EE"?? You do get products at cost right?? Profit sharing?? There are a LOT of trucks that are sponsored. When are you gonna announce it??



J. R.

 

[TxDieselKid]

Gene,



When you got your twins, you also added a TON of fuel from where you were. If you would have added all that fuel, and not twined it at the same time, you would have noticed a mili-second of lag when you would have gone to twins, unlike a single charger, of the same size as your little turbo.



It takes the air longer to reach the cyclender, think about it. Help either side any?



Andrew