Compound tuning advice

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Compound tuning advice

Postby 90_midnightmadness » Wed Feb 04, 2015 10:39 pm

So the setup is in the signature. Just to get it straight it's a 12cm gated HX35 over a 26cm housing HT60. The gate on the HX is set to open and 30psi. It's all fueled by 5x.016 MTP Injectors and a stock pump, fuel screw a couple turns or so out, preboost pretty moderate, and afc is around three turns up from the bottom. Has M&H M4 fuel pin which may be kind of aggressive. High idle screw is MIA and timing is around an eighth with a little lower pop pressures on the injectors.

In 4th gear at WOT I've seen around 58-59 total and the highest Ive seen the primary is 26-27. I've never seen over 1400* in any gear WOT. I know the data isn't exact but we haven't had very good weather for some quality testing but when I do I will get some more exact numbers. It's rather smokey down low but cleans up rather well up top. Maybe the gate needs tightened down to make the primary come ona little stronger and earlier, not sure but I am open to suggestions.

I'm understand I'm not looking for a 500hp setup with a stock pump but I feel I should be able to get more then I have now. Seat of the pants feels high 300s low 400s. I know I have room for timing ad hopefully I will have the time this weekend when I get home from school to throw some timing at it.

Any advice would be greatly appreciated. There's just not a whole lot of VE powered compound tuning advice out there.
1990 Dodge W250 SCLB. "Midnight Madness" 5 Speed getrag 4.10 gears. 5x.016 MTP injectors, HX35 12cm gated housing over HT60, 26 cm housing. Pump tune, M&H M4 fuel pin. 4 inch diamond eye exhaust, Valair Single Disc Ceramic clutch. I'm Sure I forgot some things.
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Re: Compound tuning advice

Postby Remps » Thu Feb 05, 2015 12:45 am

No gov spring yet? Gotta do that for sure. And bump the timing to a 1/4 for sure with that big of injectors. Then update with new boost numbers. :grin:
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Re: Compound tuning advice

Postby AHineman » Thu Feb 05, 2015 4:28 am

Try having your wastegate open around 20 to 25 psi and see if you drive the primary harder. I also agree with the comments about getting a gov spring and advancing your timing. I'd push the pump to the head at least.

What lift pump setup?
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Re: Compound tuning advice

Postby DMan1198 » Thu Feb 05, 2015 8:38 am

Did you drill out the divider on the hx35? If not you're only gating the rear half of the cylinders. Then as AHineman said open the gate sooner
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Re: Compound tuning advice

Postby 90_midnightmadness » Thu Feb 05, 2015 11:34 am

Yea, the divider is drilled out.
1990 Dodge W250 SCLB. "Midnight Madness" 5 Speed getrag 4.10 gears. 5x.016 MTP injectors, HX35 12cm gated housing over HT60, 26 cm housing. Pump tune, M&H M4 fuel pin. 4 inch diamond eye exhaust, Valair Single Disc Ceramic clutch. I'm Sure I forgot some things.
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Re: Compound tuning advice

Postby dazedandconfused » Thu Feb 05, 2015 12:49 pm

What are you running for fuel system mods?
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Re: Compound tuning advice

Postby 90_midnightmadness » Thu Feb 05, 2015 1:44 pm

So I believe I located a 3200 spring so I will try to throw it in this weekend if I can get some space freed up at the shop. As for fuel system mods, that's another dilemma. Right now it's just a diaphragm style cummins brand lift pump. I plan to put a piston style in it when I get the chance.
1990 Dodge W250 SCLB. "Midnight Madness" 5 Speed getrag 4.10 gears. 5x.016 MTP injectors, HX35 12cm gated housing over HT60, 26 cm housing. Pump tune, M&H M4 fuel pin. 4 inch diamond eye exhaust, Valair Single Disc Ceramic clutch. I'm Sure I forgot some things.
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Re: Compound tuning advice

Postby BILTIT » Thu Feb 05, 2015 3:05 pm

You will definitely want a piston pump. I could suck my diaphragm pump down to zero psi with my he351cw (40psi) and stock injectors.
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Re: Compound tuning advice

Postby 90_midnightmadness » Thu Feb 05, 2015 3:18 pm

I most Definently will replace it. It seems to be able to keep up to an extent for now, but I know will become an issue.
1990 Dodge W250 SCLB. "Midnight Madness" 5 Speed getrag 4.10 gears. 5x.016 MTP injectors, HX35 12cm gated housing over HT60, 26 cm housing. Pump tune, M&H M4 fuel pin. 4 inch diamond eye exhaust, Valair Single Disc Ceramic clutch. I'm Sure I forgot some things.
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Re: Compound tuning advice

Postby oldestof11 » Thu Feb 05, 2015 6:02 pm

Couple things.

Your turbo setup is about the sweet spot. What's happening is your secondary is compounding the total air around 2x, which is the upper limit of your HX35. The HX35 runs out of air around 28-32psi, 2x atmospheric (14psi) pressure.

Your lag issue I bet is your preboost, AFC pin, and AFC spring setup. While changing nothing except preboost and AFC spring tension, you'd benefit from a stock to M&H 3 pin.

For tuning, take your preboost screw and back it out flush with the cap.

Next, take grease and put it on the AFC slide. Now bring the AFC spring up 2/3 of the way. Put the spring and pin in. Lightly press down until it stops. Now move your throttle to 100% WOT. Release and pull out your pin. This should show you if you can achieve the deepest point of your pin. If you do, tighten the spring. Keep going until the spring binding doesn't allow for full fuel. Back off 1/2 turn on the spring.

Now go test your truck.
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93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Re: Compound tuning advice

Postby AHineman » Thu Feb 05, 2015 6:22 pm

There's no way your close to your setups max potential with the diaphragm pump, stock supply lines, and stock gov. spring. I think with the fuel side fixed and a big jump in timing you'll make way more power. Once you get the wastegate working better....I'd drive the primary hard and let it eat. ;)
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Re: Compound tuning advice

Postby PToombs » Thu Feb 05, 2015 6:31 pm

I noticed he has the stock exhaust manifold. That thing is restrictive too, an after market one flows about 30cfm more than the stocker.
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Re: Compound tuning advice

Postby DMan1198 » Thu Feb 05, 2015 6:59 pm

The cylinder head is rather restrictive too. If you could swing it I'd polish the exhaust side really good without removing much material, and clean up the intake as much as possible (you can go a little bigger on those ports if you want) as well as partially deshrouding the valves. That's something I'm planning on doing with my spare head when I get back from school. Might do the cam as well since that's laying in my bedroom
Ducati- professional nap taker, and thread derailer extraordinaire
Brownie: 80 dodge heavy half. Ghost cummins under the hood, and some sinister plans
The Roo Hunter: 93 w250, lifted, 2 whistle machines, and a bunch of other go fast goodies, uhh..... not there yet
Jaeger: 12 ram 3500. Lifted, exhausted, and fed an excessive quantity of air
The Huntress: 02 Jetta TDI. No muffler, egr, horsepower
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Re: Compound tuning advice

Postby 90_midnightmadness » Thu Feb 05, 2015 7:44 pm

I like to keep my spare parts in the bathroom... In all seriousness, I have a spare head laying around that we had talked about doing something with. Money gets tight in the school year, usually from spending money on the truck the summer before. This summer will probably bring some more mods. I need to get a locker before long, right now I live my life one tire at a time. A cam, manifold, and a different lift pump are for sure in the future.
1990 Dodge W250 SCLB. "Midnight Madness" 5 Speed getrag 4.10 gears. 5x.016 MTP injectors, HX35 12cm gated housing over HT60, 26 cm housing. Pump tune, M&H M4 fuel pin. 4 inch diamond eye exhaust, Valair Single Disc Ceramic clutch. I'm Sure I forgot some things.
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Re: Compound tuning advice

Postby RCCUMMINS89 » Thu Feb 05, 2015 8:19 pm

High volume piston lift pump, Cam, and some head work will make a huge difference on this set up.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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