Twin Questions

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wespruett

Cummins Fanatic
Joined
Apr 20, 2009
Messages
30
Need some advice...

1. I live and drive 5k-7k ft. out in northern NM.

2. I've got the BD Super B over a 1.10A/R T-4 EH s474. It's turning out that I need to be doing more HWY and IN TOWN daily driving. I'm running a Wicked Dragon Slayer CP3, 90 HP stix and Smarty TNT which likes setting 7 the best.

3. My RP's and EGT's are on the high side cruising 75 mph with ave. RP = 17.5-20k, and EGT's are 1-200 higher than when I was running the BD TT's with stock CP3 and 50 HP DDP's.

4. I do think my drive pressures are a little on the high side as WOT my EGT's do climb quick to over 1300 at times...

So.... I'm thinking about downsizing with the goal of maximizing spoolup, low EGT's and RP's, and higher MPG's again. Don't want to go exactly back to BD TT setup and stock CP3 unless that's part of the problem.

What if I went down to BD's R700 primary? How would the 71mm wheel and 1.25 A/R affect spoolup, EGT's, RP and DP compared to the 1.10 A/R s474 I currently run?

I think going down to 40-50 HP sticks would help EGT's alot as well. Will these still work with the R700's?

Will my stage III CP3 still work with 40-50HP sticks and R700's or will I need to go back to a stock CP3?

ALOT of questions and considerations, but I need you guys' help.

THANKS!
 
i ran the r-700's with ddp 90's for a while..lightning fasr spool up and egt's were in check...i now run there r-850's with ddp 120's...your egt's are way high.at 70mph on a flat surface my egt's are 600 tops..and your r/p sounds ok.at 75mph my r/p would be at 19,500 easy..i run a stage 3 floor it.oh yeh, at wot 1300 aint much..
 
Finally decided. Going BB with GT3788R .89 a/r over T-6/1.15 GTX4202R. Stay tuned....
 
wespruett said:
Finally decided. Going BB with GT3788R .89 a/r over T-6/1.15 GTX4202R. Stay tuned....
Click to expand...

I'd love to hear those turbo's spool up!! That's the exact setup I was wanting till I got a price quote haha so now I'm gonna stick with a single. Post a video when you get them installed..
 
I just replaced my GT4202 with a GTX4202R (T6/1.15) under my Super B. I always thought the original set up spooled quick. However, I was mistaken.
 
i also would love to see these twins. i was looking at running a gtx4294 single but decided to go twins and am lookng at about this same setup
 
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