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Old 05-08-2019, 10:27 AM   #1 (permalink)
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Dodge DR 750 build

Hi guys,

well I finally bought dream turbos DR 750 from Dynamic Racing. Happy as kid.

Now my set up:
new short block
15g
550cc
full exhaust
clutch street max
alu flywheel
supra pump+hotwire
SAFC2
wideband
scanmaster 3
etc...
well I made 414awhp (18psi), pump gas

But I finally made a decision and bought DR750,

So my new setup will be:

DR750
550cc
supra+hotwire
SAFC2 (fine tunng)
ARC2 92mm (main tuning)
SITC (timing ignition)
alcohol water injection
Stock short block



SO I need some help here.

1. First of all, what max psi I can go (safe) with dr 750 on stock short block, stock heads?
Only pump I guess 16-18psi, but with A/W inj ...?

2. I already asked but I can not decide which A/W inj should I go and which nozzle to use?

3. What I read I will need in the future 660 injectors for best performance on this setup. Is this correct?

4. If I make a decision in the near future, and change my pistons and rods for let say Wiseco... can I just swap them, or I need to bore my block?. Can I buy just stock compression and size pistons or not? My shrt block had max 6000 miles, and I really dont want to bore my block.

I would appreciate any info from dr750 owners or similar set ups.

Regards
Jaka
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Old 05-08-2019, 07:59 PM   #2 (permalink)
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Default Re: DR 750 build

What was the wait time for your DR750s?
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Old 05-09-2019, 12:36 AM   #3 (permalink)
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Default Re: DR 750 build

I think it was around 3 weeks, not sure , because I dont heve my turbos here yet (Europe), but my friend have them in USA, so I have to wait that she bring them here, when she come to Slovenia.

Bump for my questions
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Old 05-09-2019, 08:06 PM   #4 (permalink)
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Default Re: DR 750 build

16/18 psi on stock block is fine and only around 400whp. you can do that with 440/550 or 660 injectors. for the Water meth 550/660cc injectors. you will have to spray a ton of meth to max out the 660 injectors and hit 600whp. 550cc injectors will get you over 500whp and stay safe of stock block

I run stock block 550whp and is living good 3yrs now 26psi DR750s E85 1000cc injectors.
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Old 05-09-2019, 11:19 PM   #5 (permalink)
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Default Re: DR 750 build

You are probably going to need larger injectors.
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Old 05-10-2019, 09:02 AM   #6 (permalink)
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Default Re: DR 750 build

In the future, my plan is to change injectors too, just not now at the moment.

I am more worried about stock long block and 500-550awhp (that would be my wish for now) on pump and meth. Here we dont have E85.

SO is there possibillity to change OEM pistons for Wiseco or Ross pistons without bore the block? Same diameter just different material?. Or are all aftermarket pistons bigger than OEM size (standard)?

And thanks for reply guys
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Old 05-10-2019, 10:25 AM   #7 (permalink)
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Default Re: DR 750 build

Forged pistons run a little bigger piston to wall clearance so will probably need at least a hone.
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Old 05-10-2019, 10:16 PM   #8 (permalink)
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Default Re: DR 750 build

500AWHP will be safe on a stock lower end with a good tune. 550AWHP and the tune has to be spot on. Any pre-ignition or significant detonation and the pistons break. I did 600-630AWHP for a few years on a stock bottom end without any issues but I was running E-85 and also watched my tune and monitored my ecu constantly.
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Old 05-11-2019, 05:05 AM   #9 (permalink)
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Default Re: DR 750 build

What’s the point get dr750 on stock block and 550cc? My dr16t on 680cc on stock block took my piston on 17psi on pump 93 no meth
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Old 05-12-2019, 05:07 AM   #10 (permalink)
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Default Re: DR 750 build

I'm running DR750 turbos on a 170000km stock eurospec block with Bosch 870cc injectors and water/meth injection. At 25 psi of boost my injector duty cycle is 78% which equals about 678 cc so you'll most likely need bigger injectors.

The DR750 turbos really spool quickly and to keep your stock bottom end happy you will need to limit the boost at low RPM's. I run ECU controlled boost using Chrome and I ramp my boost based on RPM and load so that I don't hit full boost until 5k.
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