kawi600

Im looking into a turbo upgrade once I replace the stock injectors. The owner of the shop I go to for this stuff insists Im smoking crack when I tell him Im thinking about getting twin turbos and says you can make good power for a daily driver with a big single ( think his recommendation for the 12v was a SPS66 with a lot of fuel ). Can anyone thats run recent off-the-shelf setups in singles and twins tell me what your opinion is on this? I trust this guy's opinion.. But I wonder if the last time he dealt with twins was a homebrew setup and he spent a lot of time trying to match the turbos. It sounded like hed had bad experience in the past with them.
All the info Ive read here seems to say the twins have low lag and good power.
Im looking to get up to 500-700hp, light towing, street and daily driver. prefer lag at or lower than what the stock HX35 has. Adding sticks, studs and 191's or higher soon.
Right now Ive got my eyes on setups offered by BD power and Piers

ratsun

IMO a DD over 500hp should have twins, the only negative comments I have ever heard about twins came from those that have never had them? You wont see spool up like the stock 35 anyway you go, but the right set of twins will be closest. I have heard great things about the BD set and I wouldnt give up my Piers set for anything.

gsdog1

Rather similar thread over in the 3rd gen performance section that is currently active.

I worked through a similar decision making process over a year ago. The new breed of singles are impressive, but twins they ain't.

kawi600

Hmm, so how would you compare a SPS66 or a pro street to the stocker for response? Seems like an awfully big turbo to spool.

TxDiesel007

Hit the nail on the head there

You would need alot of fuel to spool that sucker up, but once it lit, HOLD ON.. I have a 35 with a 14cm exhaust housing... Spools like a ****.... but im slightly overfueled...

Rick

signature600

Twins are the only way to fly on a 12v If you ever need to tow, you'll hate that big single...unless you have headwork and a cam

An HX35/B2 setup would be awesome for a 500hp 12v, and it might get you close to 600, but EGT's will be close! IMO, BD's current twinset can only cool 450-500 TOPS on a 12v. I ran a set at 400 and it would hit 1350* max, but I could have used a bit more timing to help cool things down!!

I also ran a HX40/B2 setup, and it spooled OK...by 2150 RPM I had 51psi. Cooled decent, but I needed to bump the timing bad.

Chris

JD Dearden

This subject seems to be hot right know. I have sps66 and I pull around 20,000 pounds no problem at all here. But with that said I haven't pulled with a 64 or 62 or all the other turbos out there. I got the 66 because I don't like turbos that spool really fast and I am going to do twins with the 66 later.

mcoleman

On a 12 valve I would go with twins or a 62/12 that can be used in twins later. The 66's have been known to surge on 12 valves.

kawi600

hm, well it looks like Im not going to go with his recommendation on the turbo then.
If the BD twins are cool up to around 500, whos setup is good for 500-700 or so?
If I add this kind of air and fuel Ill be a bit scared of running high timing even with studs

kantdrive55

Twins for street driving are going to be the best set up. They are going to have great throttle response, much better than a big singe. They are going to also move a large volume of air in the top end, to keep egts down. Our setup is a kit that is designed for towing and playing. Our 02 shop truck is 605hp to the ground and egts seldom get above 1200deg.

The big benifit we have is because we are a Borg Warner engineering house our twin kit comes with a factory b/w 1 year warranty.

Bobcat698

I really like my Pro-Street 66 Charger, spools even BETTER than my Sled Puller 66. BTW I run 24 degrees timing with an auto.

TxDiesel007

Hmm

perhaps with water meth you can allow them to cool over 500 rwhp? I have not heard of any 12V running BD twins at 500 plus for that matter, BUT i know Rjohnson is runnin 620 plus with the BD twins.... makes me wonder...

The HX40/B2 setup sounds awesome! can probably be attained from Rip Rooks 2/3 kit, and just buying an HX 40 on the side.... what timing was run at that setup chris?

Im still lookin at BDs for possible twins cause of the value and ease to put together.. 2850 from homeontheroad.org.

Rick

signature600

The 24v head is just better than the 12v...not too mention optimal timing for all/most situations. Not just set it and forget it! With 20-22* of timing, the BD's might make over 500hp 12v cooler, but I think you'll still be over 1400* A cam and headwork would make 500hp useable get A LOT closer to 600hp useable!!

I was running 13* of timing with the 40/B2...I would have liked to had 17-18*, and been able to run the boost higher. I was only seeing 60-62psi WOT, limited by pop-offs. This was on stock headbolts, headgasket, and with 316K miles!! I was on the edge! More timing would have blown the HG, for sure

If I was doing it again, I would use a S300 (62mm/12cm or .7) on top for durability's sake. I've heard of a few people killing 40's in twinset because of pushing the intake wheel into the housing. S300's are just tougher!

My next setup will be a little more exotic thanthe first two
Chris

gwhammy

I was running a hx40 on my 12v and spoolup was terrible not to mention exhaust temps out of sight if I didn't watch them close. I just put twins on and it is probably the best thing I could have done for the old truck. I got a 35 with a 58mm wheel and a bht3e with the small 22 cm exhaust housing. On a 75 degree day it won't go over 1100 degrees at around 54 lbs. of boost. I think I might just leave it alone the way it is, it spools alot quicker than the 40 and once it starts to spool it is instantanous. With the valet switch on around 37 lbs. of boost and 900 degrees is it. It is the perfect setup for trailer towing. Now if I could talk the wife into letting me put a set on her truck but she says my truck is to quit for her ,she might just get a set anyway!

kawi600

If anyone runs the BD twins on a 12v Id like to hear what your temps are pushing over 500hp.
The piers setup sounds good but I bet the price will break me, heh
I didnt see any twin setups on rip rook's site.. are folks doing a homebrew sith two of their singles? Or is this something youd have to call and ask about?

EDIT: I take that back I found a link to the twin stuff on their site...