jwt lag?
Originally Posted by vqturbotec
Sorry to butt in but the 850 have lag to almost 4k
Havent givven up on them yet, though
Even thought the 850's have more lag down low, on the other hand, they should be able to produce power higher up in the RPM band, with a better intake manifold and headword/cams of course.
Registered User
Joined: Mar 2007
Posts: 241
Likes: 0
From: San Diego
Originally Posted by WA2GOOD
try over 4K. More like 4.2K. And we are finding this in all (soon to be) 4 cars equipped with these 850BB's. (reportedly)
Havent givven up on them yet, though
Havent givven up on them yet, though
Originally Posted by failsafe306
Even thought the 850's have more lag down low, on the other hand, they should be able to produce power higher up in the RPM band, with a better intake manifold and headword/cams of course.
The 700BB kits can, and have seen north of 700whp, with more mid range and lower end power than the 850BB's, though
But, the 850BB's are the perfect fit for some of the dynoqueens on here. J/K (kinda)
Registered User
Joined: Mar 2007
Posts: 241
Likes: 0
From: San Diego
Originally Posted by eagletanggreen
I dont know about Scott, but I really like the 850's over the 700 on the track, they are so easy to drive fast and do pull harder up top. I never found myself out of the power band when I drove it at Barber. If you drag then these turbos are what your looking for, 11.6 @ 123 on wastegate springs (boost controller off) with a 1.99 60ft. In Jan when I get back we are going up to 23 psi on thses turbos. 
Originally Posted by vqturbotec
With the kit i installed it lagged to about 4k but we were also using that prototype manifold we were telling you about.Anyways good to see u and jim getting it done.Is mark still working for you.
Got picks of this manifold??
Its good to see the west coast guys in the FI forum, It always the east coast guys on here.
Last edited by eagletanggreen; Sep 26, 2007 at 06:47 PM.
Originally Posted by vqturbotec
good to see u and jim getting it done.
Originally Posted by vqturbotec
Is mark still working for you.
Registered User
Joined: Mar 2007
Posts: 241
Likes: 0
From: San Diego
Originally Posted by eagletanggreen
Got picks of this manifold??
Registered User
iTrader: (1)
Joined: Sep 2007
Posts: 5,256
Likes: 0
From: Texas, Arizona,Cayman Island
Originally Posted by WA2GOOD
Great question, and good point.
IMO, the 850 kit is a bit too big and laggy so far for a roadcourse track car. For a freeway racer or a drag racer the 850's are the ultimate, though just a bit too much lag to be at all practical.
We are still working with JWT on some custom cam profiles and some other things to get a more usable powerband for our purposes, so stay tuned.
So far my favorite kit for all purposes is the 700BB kit (built motor of course)
IMO, the 850 kit is a bit too big and laggy so far for a roadcourse track car. For a freeway racer or a drag racer the 850's are the ultimate, though just a bit too much lag to be at all practical.
We are still working with JWT on some custom cam profiles and some other things to get a more usable powerband for our purposes, so stay tuned.
So far my favorite kit for all purposes is the 700BB kit (built motor of course)
Roadracing was my main concern. There was a Viper Venom at the track last weekend. He had a problem timing the boost and the lag was killing him. He spent more time off track than on track,my guess is he had over 700hp....
So 500 to 550 rwhp with no lag is way more than I need...
Last edited by XKR; Sep 26, 2007 at 06:59 PM.
Registered User
iTrader: (1)
Joined: Sep 2007
Posts: 5,256
Likes: 0
From: Texas, Arizona,Cayman Island
Originally Posted by eagletanggreen
I dont know about Scott, but I really like the 850's over the 700 on the track, they are so easy to drive fast and do pull harder up top. I never found myself out of the power band when I drove it at Barber. If you drag then these turbos are what your looking for, 11.6 @ 123 on wastegate springs (boost controller off) with a 1.99 60ft. In Jan when I get back we are going up to 23 psi on thses turbos.
Your setup is top notch....
I was asking Scott because he is heavy into roadracing like Sharif and I. I know he would understand what I was really asking without me having to get into some drawn out question. As we all know....if you cant get that power in a corner to get that bite because of lag or a late arrival of big boost........it could get ugly.
I think in time Scott will change his mind....trust me.....give it time
I drove both set up back to back at Barber and even Sharif could'nt tell a diffrence.
I drove both set up back to back at Barber and even Sharif could'nt tell a diffrence.
Last edited by eagletanggreen; Sep 26, 2007 at 07:23 PM.
I've heard Scott talk tons about the 850s, I don't think his mind will ever change about em lol.
Had my twins installed my Scott and I couldn't be happier. I'm not very experienced with forced induction beyond what I have, but there is no lag from what I can tell.
Had my twins installed my Scott and I couldn't be happier. I'm not very experienced with forced induction beyond what I have, but there is no lag from what I can tell.
Originally Posted by rAizE2k
I've heard Scott talk tons about the 850s, I don't think his mind will ever change about em lol.
Had my twins installed my Scott and I couldn't be happier. I'm not very experienced with forced induction beyond what I have, but there is no lag from what I can tell.
Had my twins installed my Scott and I couldn't be happier. I'm not very experienced with forced induction beyond what I have, but there is no lag from what I can tell.
Thats very good then, enjoy your set-up
so the 850bb starts spooling around 4.2k and the 700bb starts spooling at around what rpm? cause ive got the turbonetics and a tt kit is in my future but im looking for something a lil quicker spooling than the turbonetics.
Originally Posted by Scythenc
so the 850bb starts spooling around 4.2k and the 700bb starts spooling at around what rpm? cause ive got the turbonetics and a tt kit is in my future but im looking for something a lil quicker spooling than the turbonetics.
Mine spool here
Originally Posted by Sharif@Forged
[img][/img]
and my good friends Joe Greddy TT
Last edited by eagletanggreen; Sep 26, 2007 at 08:05 PM.
Registered User
iTrader: (1)
Joined: Sep 2007
Posts: 5,256
Likes: 0
From: Texas, Arizona,Cayman Island
Originally Posted by Scythenc
so the 850bb starts spooling around 4.2k and the 700bb starts spooling at around what rpm? cause ive got the turbonetics and a tt kit is in my future but im looking for something a lil quicker spooling than the turbonetics.
The 700bb start to spool at 2800 rpms
Look at where the turbos make full boost
Mine @15psi a little past 4250 looks like 14.5psi @4250
XKR's @14.5 a little past 4000 maybe 4100rpm
Joes Greddy TT@ 15psi3750rpm
As you can see the Greddys are the $hit down low spool up faster and both the 700's and 850's
looks like a 150rpm diffrence between the 700 and 850 @ 14.5psi, not a big diffrence
Mine @15psi a little past 4250 looks like 14.5psi @4250
XKR's @14.5 a little past 4000 maybe 4100rpm
Joes Greddy TT@ 15psi3750rpm
As you can see the Greddys are the $hit down low spool up faster and both the 700's and 850's
looks like a 150rpm diffrence between the 700 and 850 @ 14.5psi, not a big diffrence
Last edited by eagletanggreen; Sep 26, 2007 at 08:08 PM.
Registered User
iTrader: (1)
Joined: Sep 2007
Posts: 5,256
Likes: 0
From: Texas, Arizona,Cayman Island
Originally Posted by eagletanggreen
Look at where the turbos make full boost
Mine @15psi a little past 4250
XKR's @14.5 a little past 4000
not a big diffrence
Mine @15psi a little past 4250
XKR's @14.5 a little past 4000
not a big diffrence
Scott was talking about when the boost comes on line....when the turbo's start to register on the boost gauge. If you are on the track and you have no low end and little mid range boost and you have a driver in front of you that knows what he is doing ....he could block and brake you to death. He could keep you out of your power range on the slow part of the track forcing you to do something stupid
Originally Posted by XKR
luie....
Scott was talking about when the boost comes on line....when the turbo's start to register on the boost gauge. If you are on the track and you have no low end and little mid range boost and you have a driver in front of you that knows what he is doing ....he could block and brake you to death. He could keep you out of your power range on the slow part of the track forcing you to do something stupid
Scott was talking about when the boost comes on line....when the turbo's start to register on the boost gauge. If you are on the track and you have no low end and little mid range boost and you have a driver in front of you that knows what he is doing ....he could block and brake you to death. He could keep you out of your power range on the slow part of the track forcing you to do something stupid
Your totally right Bro.. I am just trying to answer this guys spool up question, in ref to the two turbos.
Lou
