551 A race oddity

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BigBobPilot
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551 A race oddity

Post by BigBobPilot » Sun May 13, 2018 11:49 pm

I've had to give in for the day. I started the weekend with a long list of jobs to be done before taking the car to get the engine mapped on Friday. I still have a long list of jobs... I'll have to get home from work in good time through the week.

Unfortunately I didn't get out to the garage until the afternoon, but I've sorted a job that's been unfinished for a while. The (non-standard) front section of the roll cage has a few things hanging off it. I couldn't complete the installation of wiring ECU mount etc as the cage needed to come out to complete the welding (half of it was only tacked together) and painting. A few more brackets & triangulation members made, tacked then out with it all. Another seemingly backwards step:
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I ran out of gloss black paint, so most of the cage sections are painted.
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But a few bits are just in primer.
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I'll get some more paint tomorrow, and do the GRP work to reinstate the bulkhead on the passenger side. I was making some cardboard templates for that before calling it a day.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by efi_sprintgte » Mon May 14, 2018 5:44 am

Good work, good luck at the rollers!


JC

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551 A race oddity

Post by BigBobPilot » Mon May 14, 2018 11:33 pm

This evening:

Paint buying.

Paint applying
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GRP screwing
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GRP gluing
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Well some matting, but it all rhymed.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by CNHSS1 » Mon May 14, 2018 11:58 pm

Great work on the car mate 8)

And you really are the Pam Ayres of the forum aren't you? :lol:


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551 A race oddity

Post by BigBobPilot » Fri May 18, 2018 10:24 am

Well, I've been busy all week trying to get the car ready to take for mapping. No time for photos & ramblings.

Cage section back in, bulkhead on passenger side in with heat shielding. Temporary exhaust heat shield in place, as I ran out of time to do it properly.

RH front wheel arch glassed back in around master cylinders. ECU temporarily strapped in place, as I can't decide on a final home for it. I think I need to get the passenger floor in above the exhaust first.

Loads of little bits done.
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I've got a bit of time now, as the car is on the dyno.

Initial leak checks had one inlet clamp replaced, getting rid of the fat clamps for a jubilee clip, another clamp tightened. We'll see how it goes, but I am tired!
Last edited by BigBobPilot on Sat May 19, 2018 11:00 pm, edited 1 time in total.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by philhoward » Fri May 18, 2018 10:30 am

Great to hear you made it as far as the rollers - well done!

Now here's hoping it behaves..


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551 A race oddity

Post by swoakes » Fri May 18, 2018 11:36 am

Hope it goes well Ben.

I'll be interested to see your figures and graph :)


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551 A race oddity

Post by CNHSS1 » Fri May 18, 2018 2:11 pm

Good work fella!! Can't believe you've dragged it all the way to almost South coast to probably the leading Nissan CA mapping guru, Dodgy Dave's Dynos would've drawn a plot with Crayola for you for much less effort :lol: :lol:

Well done on the build so far, can't wait to see the beast in anger :twisted: :twisted: :twisted:


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551 A race oddity

Post by BigBobPilot » Fri May 18, 2018 5:34 pm

Horsham Developments are near Newbury, so not too far for me. However, I find it is good to go to the people who know the engines. For the Marcos' Essex V6, we went to Ric Wood, he's not close.

Anyway enough of that, time for a cider in the sunshine, now everything is unloaded & put away.
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Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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BigBobPilot
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551 A race oddity

Post by BigBobPilot » Fri May 18, 2018 6:36 pm

Update:
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Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Fri May 18, 2018 6:47 pm

Ah, lovely sunny day off work, spent in the countryside. What could be better, except some hooligan was running an engine up to full revs, how inconsiderate!

After arriving at Horsham Developments, for my engine mapping session, the first thing they did was to pressurise the intake system at the turbo inlet to look for leaks, there were two. One was cured by tightening the clamp a little, the other required the removal of the Mikalor clamp, to be replaced with a jubilee clip. Here's the fella:
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Jez Horsham runs quite a few cars on dynos and he said jubilee clips on a swaged pipe are the most reliable for silicone hoses. So I’ll be saving myself money there in the future. One of the coolant hoses had a slight drip too, where the Mikalor clamp has bottomed out, so I’ll replace that too.

Next up was just running through checks on the dyno, the engine kept leaning out, after checking the fuel system, there was no pressure drop-off, the culprit was a dodgy lambda sensor.

I’d bought a 2nd hand HKS electronic boost controller, as the Nissan ECU doesn’t have a direct boost control as such. Although this did work, after a bit of fiddling around, it was not one Jez was familiar with. I said that if they had an alternative in stock, I’d go with that, as it was going to be cheaper to buy a new controller & get the mapping complete, than fiddle around & potentially have to do a repeat visit another day. The new one also allows easier switching between boost levels, so I can easily select a lower boost level for wet races. So they didn’t need to do much of a sales pitch, I’ll put the other one on to ebay.

The other issue was a slightly odd reading from the air flow meter, this was corrected by modifying the aluminium connector pipe with a flow straightener, to reduce the swirl in the pipe.

I had hoped to get the car roughly water tight, with the hardtop & doors on, but I haven’t put the windows in either the doors or the hardtop yet. I checked the weather forecast, it said no rain. It was right, it was lovely & sunny. So I left the hardtop at home. I did think the rear wheels should be covered, to stop rubber being flicked up, but I’d not fitted the wings & rear arches since I put the springs & dampers on – there was a clash that I need to address. I did take them with me & I offered to fit the wings (without wheel arches) but I was told it should be ok. So it looked the same as it has in the garage for a while, but with my trailer piled up with all the bits taken off, but with a big tree in the back ground.
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However, the lack of a door or passenger seat / floor lead to some improvisation for locating the laptop, one of the chairs from the class room where he teaches engine mapping!:
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After resolving the minor issues, it was on to the mapping, in here:
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The keen eyed will notice I took the photo when the MAF to turbo pipe was off for modification.

I'm back home, with everything in one piece & running nicely.

That's about it. I can't imagine anyone is interested in the pub figures, after all, it's lap times that count.
Last edited by BigBobPilot on Sat May 19, 2018 11:07 pm, edited 1 time in total.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by swoakes » Fri May 18, 2018 7:03 pm

BigBobPilot wrote:
Fri May 18, 2018 6:47 pm
That's about it. I can't imagine anyone is interested in the pub figures, after all, it's lap times that count.
Wrong :!: :lol:


Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

Image
"Fail to prepare and you are preparing to fail."
Benjamin Franklin

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BigBobPilot
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551 A race oddity

Post by BigBobPilot » Fri May 18, 2018 7:56 pm

Really?


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Fri May 18, 2018 8:07 pm

My engine is untouched internally, I replaced the crank due to worn thrust bearing faces, the crank was re-ground with new big-end & main shells, but that’s all. It has got vernier pulleys on the cams, to get the timing spot on, but the Nissan machining seems to be very accurate anyway, so I’m not sure if this was necessary. I was initially aiming at Horsham’s stage 2 spec, as I had a chip for that in an ECU, but I had the bigger injectors & I bought a Z32 MAF sensor, so I thought I’d go for their stage 3 spec. After a bit of discussion, due to the quite different application from an S13 and the fact I was going to get it all checked on the dyno anyway, I went for a mappable ECU mod (Nistune board) and have the car mapped, rather than go for an off-the-shelf spec. However, I’ve missed the critical element of the stage 3 spec, the hybrid T28 turbo. I’ve got a standard T28 turbo as fitted to the SR20DET S14’s.

It’s coming in pretty much what Jez said he would expect from this spec. he said it needs a bigger turbo for more (power / torque / expense)

Their stage 2 is quoted at 260 – 280bhp
Stage 3: 290 – 330 bhp

I went there thinking I would be happy with 260bhp or over and a nice flat torque curve. I came away with 262bhp & a nice flatish torque curve, so I’m happy. It’s a good start point for the car. In reality, it seems apparent that the bigger injectors & MAF are giving me nothing, but that it kind of expected. They are specified to allow the use of the hybrid turbo.

I discussed options for my next engine (sitting waiting for me at the back of the garage) but I need to get the car out & get the handling to my liking and see how the gearbox goes, as the Dark Destroyer of Gearboxes (AKA Craig Hughes) has shown that with 360 bhp and some abuse, they don’t like it up ‘em.

Here it is back home just off the trailer, sitting idling happliy
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The oli patches are from a little bit, the Jag XJR (power steering) but mostly the recent addition of my coupe gearbox oil,

In all below: Green - max boost (1.05 Bar); Red - low boost / rain map

Power & torque
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Power & lambda
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Boost & lamda
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Last edited by BigBobPilot on Fri May 18, 2018 9:23 pm, edited 1 time in total.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by efi_sprintgte » Fri May 18, 2018 8:10 pm

I have had a few issues with those clips in the past too, and they are not cheap when compared to a jubilee clip!!


JC

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