Picked up a JRSC

Post by **Gaskleppie** » Wed May 28, 2008 12:18 pm

The flapper is vaccum.... Interesting.

The flapper valve is indeed vacuum. You got a problem here cause you wont have any vacuum in the manifold to open the valve under boost. Maybe use an other type of valve from an old turbo or so.

JaredKaragen · Post by **JaredKaragen** » Thu May 29, 2008 12:31 am

If the valve see's boost it will be held closed; I see that... this could be doable if I add some sort of water injection to defeat detonation/heat; **trying to stay away from nitrous for a while =) Thouugh I do have a direct-port kit I can rob parts from. Or as before stated use a solenoid to switch the vaccum like off from the manifold to the valve, and have the valve routed to atmosphere when WG boost is achieved. This will still let the flapper do it's job of releasing pressure in the manifold when the throttle is closed (because after boost is lost; solenoid closes and re-enables the vaccum to the valve...) but I am still thinking of different ways; I just shot out that email =) The tune is getting better; I am had to chop bits from this, and bits from that; and the rest is all hand smoothed/drawn.... filling in the gaps. I was looking at the setup; and my resulting log; and I noticed something that didn't quite seem right at-first; the MAP sensor is on the TB; but the TB never sees boost... correct? Which brings another question: How does JRSC effectively use a boost map? I looked at my log from the other night; no boost signals; just atmospheric pressure... so, I am thinking move the MAP to the charged side of the JRSC ASAP.... but this might leave an interesting factor for adding the turbo along with the SC; SC gets tuned out; then any time there is boost seen on the MAP, it is known to be coming from the turbo.... so I would need an extra vac/boost gauge hooked up to the VAC side of the SC intake for seeing boost pressure seperate; going ricer here! All in all, I am still getting ready to put the turbo kit back on... Pings are almost gone; I am finishing smoothing those out and I will pop the turbo back on.

sewell94 · Post by **sewell94** » Thu May 29, 2008 1:02 am

You have to use the vaccum port by the brake booster to see boost, the map on the Tb wil not see boost. That could by why you are seeing some pings, i see no reason why that map should ping at all on your engine, my money says move the sensor, pings go away. I need to do a project somethign like this, compound turbos, or maybe a 671 and a 68 mm turbo, something really fun

JaredKaragen · Post by **JaredKaragen** » Thu May 29, 2008 3:14 am

Wow; Well, I guess that explains the changes taking effect only at atmospheric pressure; and the major differences between the 2 tunes I have seen. I have a Xenocron 2.5BAR in the mail; should be here by sometime next week... till then, I have the pings out so it's rockin. Or if I visit the shop, I will grab one of my spare OEM sensors, and affix a hose to it and plug it in. Sheesh; The JRSC can be a PITA sometimes; first the stupid alternator clearance issue (Hondata intake gasket FTL on that note, but worth having) and another funny issue of the charger being that much in a different position so the belt gets awfully close to the timing cover... still plenty of room though. And lastly, the necessity of mounting the alternator to the bracket, but with a washer between the ALT and bracket... or else the belt hops one rib off the pulley.... Once again, awesome feedback!

Post by **calvin** » Thu May 29, 2008 8:46 am

JRSC was design as a piece of shit.. that is why it doesn't read boost. you need a mapsensor that reads boost.. Take from the FPR line or brake booster. EDIT: Not a piece of shit.. It was old there was no ecu/hondata or whatever.. They used a 12:1 FPR... Well u know how to solve

sewell94 · Post by **sewell94** » Thu May 29, 2008 11:48 am

You had it right, they are a piece of shit.

Adam Hopkins · Post by **Adam Hopkins** » Thu May 29, 2008 8:24 pm

sewell94 wrote:You had it right, they are a piece of shit.

+2 They are not as good as turbo, but the jackson is still better that n/a. lol!

sewell94 · Post by **sewell94** » Fri May 30, 2008 2:41 am

So did moving the map help?? i see you posted a map for both spots

JaredKaragen · Post by **JaredKaragen** » Fri May 30, 2008 3:29 am

Yep, like a cham... very snappy now; missing the ooomph without relocating the MAP. I plan to hit this out on Saturday; because I want to take the time after work on Friday to inspect the turbo kit and clean everything up.

JaredKaragen · Post by **JaredKaragen** » Mon Jun 02, 2008 1:46 am

Ok, got it done... and yes; I am rockin a little PVC still =) for lack of materials on-hand, and I didn't want to hack up the elbow for the non-SC setup. Pics:

The alternator mod I was talking about before

Oil line location... barely fits... _BARELY_

Videos as soon as I am able

If my buddy has his camera, I will make him take a vid for me so I can post it up tonight... But, I took it for a test drive to get some VP gas... Running 91 still. Boost-cut by 3K... snappyness of the SC is missing, but I need to retune for the Motorola 2.5BAR.. but turbo takes a second to spool, but it spools very early... shoots right up to 11PSI+... boostcut is set there for a reason

This was with no flapper valve modification... Now, I have my PCS routing the flapper to open air when under 7+PSI boost... helped a little; it doesn't violently hit boostcut now; maybe I can get vaccum from the elbow off the turbo the air filter hooks up to. All in all; I am safe, drivable... and OMG it wants to pull... soo hard it whips you back and forth from boost cut... I wish I still had my [now stolen] G-tech PRO... get some G force readings

soooo.... SUCCESS! Let the tuning and R&D on that stupid valve begin!

JaredKaragen · Post by **JaredKaragen** » Tue Jun 03, 2008 11:12 pm

Calvin, I never got an email back from the guru... I guess I will try hooking a vacuum source froom the turbo inlet next; maybe that will help; but I need a bigger solenoid that flows more for the flapper valve line; I think the OBD1 PCS doesn't flow enough for response.... BTW: up to 18.x PSI boostcut, and it hits pretty fast... I am not turning it up any more until I get that flapper valve under control

Post by **calvin** » Wed Jun 04, 2008 12:45 am

who gaskleppie? frank @ ectune.com

JaredKaragen · Post by **JaredKaragen** » Sat Jun 07, 2008 2:26 am

Just an update: I have my 90 elbow off the turbo inlet to a cone filter pointed down. in the 90 closest to the turbo I felt necessary I drilled and installed a barb fitting to a vacuum hose. This goes to the PCS instead of routing the flapper valve to atmospheric pressure. This did help significantly, but I am still hitting just above 18.5PSI or maybe it's just the spark blowout I have been seeing with having the tune soo right when doing the R&D work (more fuel, safer for the motor during test with pulls). I just need to gap a little smaller, probably around .026 or so.... But I really just should run it a little leaner for better results. On the subject the OBDI PCS I think is a huge restriction, I know the vac hose is the right size and plenty large; not too big though, the same size I use on my WG and BOV. But this is going to a restrictive PCS that needed zip-ties to securely attach the hose to it... so I need to try an OBDII sensor and switch up the wiring; or perhaps try wiring in that N75 solenoid from a VW to see if that does the trick. I will keep updated! Once I can actually do some WOT pulls, I will post up the .cal

JaredKaragen · Post by **JaredKaragen** » Thu Jun 12, 2008 3:25 am

Ok, things are going good; turbo's WG is opening up completely; so things are as they should be. I need to figure the magic switchover point and I am good to go. screenshot from tonight:

JaredKaragen · Post by **JaredKaragen** » Thu Jun 12, 2008 11:52 pm

Ok, This is waaaay worse than without the SC, but maybe some of the tuners out there have seen the \"Evil Eye\"

I am a little perplexed and want to blame my battery offset tables... any opinions? It clearly needs it leaner than hell in that zone, and wants it richer than hell in boost up there....