what are folks thoughts on factory manifolds having poor w/m distribution? after watching engine masters with holdener claiming it wasn't great I'm wondering how effective it would be for someone like me who wants to use it as a octane booster because I'm limited to 91 or 95 UK petrol. am I going to see very lean cylinders on one end and very rich on the other?

 

Do a direct port system if you are really concerned.

I don't think Holdners tests proved anything. They were poorly done at best and saturated sensors don't tell you diddly. If what he was saying was true, a direct port system with even distribution in each cylinder would do a better job than an intercooler. It doesn't! Think of it more as race gas and less like a charge cooler.

But if that is something you are worried about you can get nice water meth nozzles for $5 each and push to connect tubing and fitting cheap on ebay. A direct port system isn't very expensive if done this way. If you gave us a run down on what you are wanting power wise I'm sure suggestions on nozzle size and pressures could be given.

 

Agree that Holdener test wasn't skewed at best. Plenty run WMI injecting at the TB with no issues.

 

VPower is not 91, probably more likely 94/95MON in the US. When it's readily available in the UK...little sense to not use it.
But unless the build has excessively high CR, or very poor chargecooling, meth is not essential, although it can be beneficial.

Although him testing a single runner at a time, using temperature only as a guide....is a pretty flawed test. It should really have been done all cylinders on the same test, and on a very slow ramp.

If you were really stuck on it, you could just do port injection, but most setups seem pricey and messy.

I did also query their test and ask them to repeat it with 8 Lambdas as well...but that never happened either, which would have been a better test too.

 

I'm looking to make 600whp on 91 but I'm unsure what ratio to run at. I have a aem v1 with asingle 750 cc nozzle.

 

Really don't see why you just want to use regular UL fuel ? Just doesn't make a lot of sense when much better fuel is available for not a lot more money ?

What compression are you at ?

 

243 heads on a 4.8 so I'm guessing 8.8-9.0:1 maybe

 

With decent charge cooling, just wind the boost up. It's plenty low to be safe, unless it's a turbo that's too small for the job.

 

there aren't that many places near me selling 97/98 fuel

 

Weird...anywhere I've ever been in England it's common ? Remote parts of Scotland not so much. And here in NI....**** all, well we do get SUL here, although many question its quality. No VPower anywhere here, Not even Shell anything lol. They bailed out years ago.

But you're low enough compression it's not a big deal.

 

This plumbing style always seemed pretty well laid out and inexpensive to me.

 

Do you know of a source to get cheap nozzles? The only problem with the McMaster ones is that they can't be screwed into NPT threaded holes.

 

http://www.greatplainsupply.com/en/nozzles/110-outside-mount-nozzles-do1.html

 

Thanks for that link! I've been fighting with the mcmaster ones. Now what about sizing? How do you know what size you need?

 

The calculator on the devils own site is pretty good IMO if your spraying 50/50. If you spray washer fluid I drop the number by half as a starting point.(high water percentages really drown out spark and power) So if it states you need 14gph worth of nozzle I go with 7. You also have to factor in pressure as flow rates on those nozzles (and most others) are calculated at 100psi. Many pumps will to 200-300psi. Flow does not double with pressure either. So a 5gph nozzle won't flow 10gpoh at 200psi. You have to use a formula to calculate it.

 

Horrible design with all those push fittings in a hot engine bay. Visually it may look ok...but I'd never use it.

And is each nozzle with it's own built in check valve so it cannot draw in under vacuum ?

 

And while many pumps claim 2-300psi....when they're actually flowing usable amounts, they're nowhere near that pressure. They might make 2-300psi with little baby nozzles. 10gph and upwards...no chance.
My so called 200psi pump only manages around 140psi with around 15-16gph.

Although it would be great to see others logging pressure too, in case my pump is a sad freak lol.

 

I've used those push fittings in my engine bay for years and years with no issues. If its on top or under an intake manifold I don't see it being an issue. But sure, some common sense is required with routing and placement. If you use 50/50 mixtures it isn't even flammable, so not a lot of risk IMO.

The Devils own pump I use is rated at 40gph at 100psi. Id run a 5 at each runner. Then PWM the pump as needed and let it eat. The volume those lines hold is pretty minimal. A single check valve at the feed would likely be fine. If it was really a problem you can get the Viton push lock check valves pretty reasonably and put then at each nozzle. The devils own pumps have internal check valves in the pump as well.

I have an old shurflow pump (don't even recall the model) pressure bounces like crazy but at 100% DC it will bounce up to 155ish psi.

I have a pretty rinky dink setup and not much into it. But it works well on my non-intercooled 5.3 twin setup. I spray pre-turbo.

 

currently I’m spraying pre turbo on my 5.3 with a 5gph nozzle. It comes in at 16 psi and seems like it kinda cuts power for a split second as it comes in. I was thinking about going down on nozzle.

 

You may have too much water in the mix. What pressure? Are you using washer fluid? I use 2 bottles of the yellow "Heet" (which is basically 100% methanol) with each gallon of 30% washer fluid. I'm told this yields around 50%. May try upping your methanol content instead of pulling back volume. If it still bogs try reducing pressure a bit.